Ysengrin: You should admire this body Lord Coyote has gifted me with, Renard. Now the very trees of Gillitie are under my command! Reynardine: I tremble in the presence of your terrifying skills of gardening, Ysengrin.
Luna from Il Sole penetra le Illusioni has the ability to create magical vines. Meanwhile, Akari's association with The Sun causes plants near her to grow very quickly.
Giorno Giovanna of JoJo's Bizarre Adventure, his stand, Gold Experience, allows him to give life to inanimate objects, which just happens to include creation of plants, plants that can hurt you if you swing for them (but not how you think).
Hakuryuu in Magi - Labyrinth of Magic gets these kinds of power once he acquires the Earth Djinn, Zagan's powers. The abilities are quite versatile too, varying from controlling plants, to making his own earth creatures that he can command.
Shirabe of Mahou Sensei Negima!! has some mysterious blood-line trait allowing her to grow and control vines anywhere she feels. So far, it's been used as a villainous example of a Worf Barrage in her attempt to taunt, bait, and defeat Kotarō.
Utahime/Kahimi from Mon Colle Knights can summon giant vines and control the lifeforce of any plant through song.
The Mokuton power in Naruto gives its wielder the ability to create wood from some strange fusion of Earth and Water jutsus and allows full control of all wooden entities as well as the ability to suppress Tailed Beast chakra (possibly a reference to how trees were often used to contain monsters in Japanese mythology). The use of this ability is only possible with the DNA of the 1st Hokage, making the only users him and Yamato (who had the First's DNA implanted into him at a young age). Other users include Danzo, Tobi, and Madara Uchiha, who spliced the 1st's DNA into themselves, and Zetsu, who was created by using the 1st's DNA.
The purified chakra of the Kyuubi acts somewhat like this. Even the chakra-fueled wood of Mokuton blossoms into leaf in its presence. This was then weaponized when Naruto discovered the chakra could forcibly transform Zetsu's clones into trees.
The anime-only villain Bins from the twelvth movie One Piece Film: Z ate the Mosa Mosa no Mi, which allows him to grow plants at a ludicrous speed and control them.
Courtney from Pokémon Special is an interesting variation as she doesn't have superpowers; she instead uses berry juice, tree sap, and acid for a variety of purposes including burning someone's eyes, glue, melting, and so on. Her knowledge of plants likely comes from the fact that she used to participate in contests.
Shin, the Knight of Plants, in Prétear (and Himeno, when she "merges" with him). For the record, he is the weakest of the seven Leafe Knights, but this has more to do with his age rather than his powers. The anime adaptation conveniently utilizes his abilities by giving him the task of creating Phantom Zone using plants during each battle.
Moreso in Suiseiseki's case since we see her growing plants more often than her sister and to drive the point home, her Drama CD song is called "Green Thumb" (Midori no Yubi).
Hina-Ichigo also has plant powers, but she is far weaker than the twins.
Sailor Jupiter of Sailor Moon uses plants more than thunder in her attacks in the manga. The Ninetiesanime stripped this element of her powers entirely, only invoking this in her final attack, "Jupiter Oak Evolution", which still used thunder instead. She even wore a belt filled with potpourri in the manga and this is retained in Pretty Guardian Sailor Moon.
Evil example: Tellu of the Witches 5 (who is one of Sailor Jupiter's evil counterparts) in Sailor Moon S specialises in plants that steal people's souls (or Heart Crystals in the anime), while in Sailor Moon Super S, Cere Cere of the Amazoness Quartetto manipulates flowers.
Kusano in Sekirei has this as her power. She even carries around a little potted plant with her at all times and can use said plant to snag people with vines.
Taruto in Tokyo Mew Mew turns regular plants into Plant Aliens in order to use this ability. The other enemies just use mutant animals for their MOTWs.
Aki Izayoi/Akiza Izinski of Yu-Gi-Oh! 5Ds uses the Rose archetype, most of the members of which are Plant-Types, and her psychic powers bring them to life.
Kurama of YuYu Hakusho, who shows just how dangerous this ability can be when given to someone who employs Batman Gambits in battle.
As Green is the color of nature, any Green planeswalker in Magic: The Gathering would generally fall under this.
Of the printed cards, only one of the two green-aligned ones printed so far have exhibited direct control over plants (in the form of land manipulation). It's also fairly common to assume that a planeswalker card doesn't represent the planeswalker itself, but a pact made with that one, so the other could use magic to mess with plants. In addition, there are still numerous non-planeswalking green-aligned wizards with this power.
Arguably, if you've picked the right cards for the deck, the player could fall under this trope.
Batman foe Pamela "Poison Ivy" Isley is one of the most famous examples of this trope. Her levels of deadliness vary across different adaptations. She has shown some capacity for good, also. When Gotham was in the midst of No Man's Land, Ivy killed Clayface and used her powers to grow fruits and vegetables for the stranded people to eat in a coordinated effort with Batman. Other times, she can at times be an eco-terrorist, ranging from destroying polluting industries to considering exterminating the human race so they'll knock off the polluting.
Otherwise, she gets her kicks by feeding people to giant pitcher plants and Venus Fly traps. Lady's in Arkham for a reason.
Also, her predecessor, Jason Woodrue, the Floronic Man.
Redlance in ElfQuest. And, of course, his ancestor, Goodtree.
Green Thumb in "The Freshmen".
Legion of Super-Heroes, Chlorophyll Kid of the "Substitute Heroes" has this essentially taken to its logical conclusion - he can accelerate the growth of plants, and that's his only power. The inability to actually control plants is the largest reason for him never being accepted.
Want to know why E.T. came to Earth in the first place in ET The Extra Terrestrial? He was a botanist, studying alien (to him) plant life. And he did seem to have a symbiotic relationship to plants as well as with Eliot. When he "died" a flowering plant seemed to wither and die; then, when he came back to life, the plant bloomed again.
Will's best/girlfriend, Layla, in Sky High. Though she's classified as "Hero Support" AKA a sidekick, she ultimately shows as much power as any of her superhero classmates.
Belgarath, challenged on his identity early in the Belgariad, proves it by jamming a twig from his horse's tail into the cracks in some flagstones and growing it into an apple tree. Then he orders the knight who challenged him to care for that tree for the rest of his life. At last report, the knight and his family still were. Similar feats of plant manipulation appear sporadically throughout the series.
It wasn't just the tree he'd sold to the lady, it was EVERY tree and then some. He brought everything that was or had been a plant to life and riotous growth. That included the dried spices in the pantry, doors, and decorative wooden screens. He made them all so strong that trying to burn them down didn't work.
Briar and Rosethorn specifically cultivate seeds to put in little cloth balls so they can plant them at need. This in itself is not terribly impressive until you learn that those seed balls either become clinging vines that can restrain large numbers of heavily armed people, rock-destroying plants accelerated so they can tear down stone walls in a matter of minutes, or vines with incredibly sharp thorns, which Briar can grow so fast that he uses them to rip straight through an assassin who thought he could sneak up behind his back.
They also have the ability to boost the natural abilities of plants. When their city was struck by plague they spent hours in the medicine stores, making all the dried herbs and treatments super-powerful, saving hundreds of lives. Similarly, they also use their powers to grow larger and healthier plants, and research diseases afflicting crops and forests, showing the peaceful powers of this trope.
Woodcrafters in Codex Alera, though no one in their right mind would mistake them for useless; a Knight Flora can basically become invisible if there's enough plant matter nearby and they're some of the deadliest archers ever, since their abilities give them Improbable Aiming Skills. Woodcrafters can also sense changes in plant matter as well, making them excellent scouts and sentries. A good woodcrafter who is also a good earthcrafter, like Bernard or Fidelias, is an even better archer, being able to wield ridiculously large and powerful bows thanks to earth-granted Super Strength.
Woodcrafting can also be used to grow crops really fast, but this feature is not generally made use of because it exhausts the soil within a couple of years.
Octavian makes an epic use of this in the sixth book, when he needs to brake through walls that have been furycrafted to shrug off fire and lightning, and be impossible to break via earthcrafting. So he summons wind and water to cover the wall in seeds, then makes them grow so fast that they rip it to pieces.
Aretzes in The Quest of the Unaligned get this as one facet of their earth magic. Though this power is often used to promote the growth of crops, limited numbers of aretzes (and the fact that they are primarily healers) mean that a lot of ordinary agriculture is needed as well.
In the Rainbow Magic series, plant and flower-themed fairies have this power.
Swan in Swan Song has this uncanny ability to cause green to sprout despite a seven year nuclear winter.
The Trope Namer is almost certainly Tistou, from Maurice Druon's Tistou les pouces verts ("Tistou Greenthumbs", in English), who has the power to make plants grow faster with but a touch of his thumb.
The Nym in The Wheel of Time series, are plant people with such powers. They were created specifically to help grow crops and gardens. The Ogier have a lesser ability called tree-singing, which can strengthen a tree and hasten its growth, or encourage it to grow into a specific shape like a chair or staff, which will be far more durable and lasting than ordinary wood.
Irene of Xanth only has the ability to make plants grow, but the selection of plants (Xanth is home to a plethora of deadly, gigantic, ambulatory, carnivorous plants, as well as explosive cherries and pineapples) available to her is such that this is pretty damned useful.
Landwights from Lost Girl. Appropriately enough, one is working as a gardener at a country club.
Shinkenger/Samurai was a rare version to not file plant and rock powers under 'Earth,' giving the plants to Green and the rocks to Yellow. This keeps us to four elements instead of making lightning the fifth like most element-based series. (Well, amongst the starting five. The Sixth Ranger has Light.)
Demon The Fallen has Lore of the Wild, which is quite useful. Examples include plants, including ivy, tearing down a wall, as well as the usefulness of being able to sense things which are near to plants.
The 3rd Edition of Dungeons & Dragons features the Verdant Lord prestige class, which took Druids (already quite green) and turned them into masters of plants.
It returns in Fourth edition as a paragon path for the Warden, the PrimalDefender class.
Not to mention certain Priest skills, like Shilelagh and Entangle.
Druids and Plant College mages in GURPS, especially with Plant Spells supplement.
Scion features the Boon of Fertility, which is generally considered to be one of the lamest Boon sets in the game, seeing as the Hero rank powers range from "keep a plant alive no matter what the conditions" to "make sure a crop suffers no blight." Mind you, some of the higher level powers are interesting, like, "make plants grow anywhere" — especially since the accompanying illustration depicts a car overgrown with vines.
A little imagination makes this Boon set somewhat frightening, particularly in the hands of an amoral Scion. Remember, people used to sacrifice their children so that the crops would grow...
It gets better if you tough it out. Some of the higher level powers allow you to accelerate plant growth at ridiculous speeds, to the point where you can create a forest in seconds. Another power allows you to spontaneously create any sort of plant in existence, and it can be used to create instant battering rams. You call Fertility a lame power when someone hits you with a redwood tree at a hundred miles an hour.
The Element Lord of Jungle on Bara Magna has this power, of course. He once used it to kill a bunch of warriors in the Core War by fusing them to the trees, their remains becoming the Forest of Blades.
Konoha's default Arcana Moriomoto from the Arcana Heart video games.
Bloodline Champions has a bloodline called the Thorn. Against the usual characterization of these powers, Thorns are monsters who've twisted plants to serve them in their attacks.
In City of Heroes, Controllers and Dominators have access to the Plant Control power set, which ultimately allows for the creation of a healing tree and a walking fly trap.
While Dalish Keepers didn't have unique spells in the first Dragon Age, in the Awakening expansion and Dragon Age II Velanna and Merrill, respectively, have special spell trees (no pun intended) that fall into this category. While the effects were somewhat simplistic in Velanna's case, with increased nature damage and attacking roots featuring prominently, Merrill's Keeper spells include powerful AoE spells that inflict nature damage, gaining health from the damage inflicted by the previously mentioned spell (even if she's using Blood Magic at the time), and teleporting with roots.
The Golden Sun series lumps this in with the earth element. Matthew, the hero of the third game is the first to have plant based spells in his default class, but he doesn't really develop the ability.
Himi, the second Venus adept in the party is able to cast all of the plant-based Psynergy in the game.
Kid Icarus: Uprising has Viridi, the goddess of nature. It also provides a very extreme example with her Fantastic Nukes called Reset Bombs, which are intended to turn areas to their original plant-covered state.
Ōkami has the Hanagami, a trifecta of plant-based Brush Gods, Sakigami, Tsutagami, and Hasugami. When you get their power, drawing a circle around a dead tree, scribbling over a miniature cursed zone, or painting a dot on fertile ground yields Bloom, drawing a line connecting a Konohana Blossom to something makes a Vine (inverted in the sequel), and drawing circles on water creates Lilypads for you to walk on water.
Grass-type Pokémon are said to have these powers either by using built in plant features or creating/manipulating plants around them. They also tend to specialize in Standard Status Effects and learn lots of moves that poison, paralyze, or put opponents to sleep, rather than dealing lots of direct damage.
Kanto gym leader Erika, Sinnoh Gym Leader Gardenia, Unova Gym Leader Cilan and Kalos Gym Leader Ramos all specialize in Grass-type pokemon.
Oddly, the most straight-forward example of this trope might be the Pokemon Florges (and its pre-volutions, Flabebe and Floette) who use interacting-with-nature moves as her bread and butter, despite being a fairy type. Her main function in a battle is to power-up grass-types on the same team. You could think of it, as, true to the trope, using nature as a weapon.
The Chloromancer, one of the Mage sub-classes of Rift, is built around using the Plane of Life to conjure plants. While most of their magic is weak, through the use of "Veils" they convert most of the damage they deal, if not more, into healing to people around them, making them incredibly powerful group healers.
Despite appearing to be an ice magic-user, Eifer Skute of RosenkreuzStilette actually manipulates plants and flora.
In Secret of Mana, both the girl and the sprite learn a few nature-based spells from Dryad, the Tree Spirit.
Hawk's Wanderer class in Seiken Densetsu 3 is a good example because he can learn all of Dryad's spells but one. Incidentally, he can also learn all but one of Luna's spells.
Instruments endowed with Dryad's power.
Anegakoji Yoritsuna from Sengoku Basara is an Ineffectual Loner who lives in the forest due to his dislike of other samurai. His powers include dropping huge tree limbs on his opponent.
The second and third The Sims games: In The Sims 2, Sims with a golden talent badge in gardening can talk to plants and improve their quality. In The Sims 3, Green Thumb is actually a Sim trait. With the introduction of a Supernatural expansion, Fairies are this.
The magical element that draws from the Green Moon in Skies of Arcadia is labeled "nature", and it resembles the Wood element; one of the magic attacks drawing from the Green Moon is a toxic gas. Also, the continent under the Green Moon, Ixa'taka, is covered with forests and the moon's magic allows it to grow and quickly recover from damage.
Tytree Crowe in Tales of Rebirth possesses the Force of Plant, which he sometimes uses during his artes.
Yuuka Kazami. Despite being one of the most powerful beings in Gensokyo, she's actually a downplayed example. Perfect Memento in Strict Sense said that her power only consists of minor things like making flowers bloom, tilting the direction of sunflowers, or reviving dead flowers. This is explicitly said to be useless in battle and only serves to make her attacks prettier. She, however, still has very strong Youkai powers, and she loves her flowers. Do not hurt any of the flowers she controls. Just. Don't.
Wood is one of the elements that Patchouli is able to use.
Suwako Moriya has it as a part of her earth god abilities, and the Mishaguji she controls manipulate fertility of the soil.
Naturally, War Craft III Druids (particularly the hero version, the Keeper of the Grove).
Two heroes in Defense of the Ancients: All-Stars are tree-themed, Rooftrellen and The Prophet. Rooftrellen has abilities that make teammates invisible when they are near trees, plant trees that give sight, wrap allies in protective regenerative plants, and summon vines to disable all enemies in an area, while The Prophet can teleport to any tree on the map, summon treants, and snare an enemy in a ring of trees.
Druids in World of Warcraft have several plant-based spells, including, but not limited to, entangling roots, growing thorns over their bodies, summoning treants, or turning into them with a boost to their healing spells.
Balance Druids, in particular, focus on this trope. Cataclysm expands this with exploding Magic Mushrooms that leave behind fungus that slows enemies. Restoration druids get to grow healing plants as a side effect of their spells.
Anyone with the Herbalism skill has access to a haste-increasing ability which causes flowers to sprout around them.
In the webcomic Ava's Demon Maggie is an example of this trope.
The webcomic Bob the Angry Flower has Plantae, a supervillain whose plant control powers are useless because plants can't move. Only Bob is truly susceptible to his control, and even that is hit-or-miss.
Phyll from Godquest is the God of Plants and the Home, so this comes naturally to him.
Soveshei and Veithel of Juathuur. The latter actually turns into a tree!. And Merlu, the god-in-the-tree.
Sul from Kiss Wood can't command the trees and plants but they choose to help him without him understanding how. For example, when they come to a broken bridge that they need to cross vines and tree roots come out of nowhere and rebuild the bridge for them to cross.
From the Global Guardians PBEM Universe: superheroes Ivy, Verdant, Gardemer. Junglemaster, Archdruid, Forrestal, and the supervillain Kiku can all cause plants to grow and move as they wish.
Hanami of Tasakeru wields the Mage Flower, which can grow pretty much anything, anywhere, in any shape. In a subversion of Reed Richards Is Useless (as mentioned above), she provides much-needed food for the other Outcasts.
Waterbenders in Avatar: The Last Airbender possess the ability to manipulate plants by bending the water within them, unofficially dubbed "plantbending", though only one person (Huu) has been shown using it. It ranks low on the lameness scale on the basis of the main practitioner using it to form a humongous organic mecha which he operates from within, using entangling vines and brute force on his enemies.
Ben 10: Alien Force's Swampfire. In addition of being himself a plant, he can generate a gaz that allows him to control plants. If there are no plants in the area, he can also spawn seeds that procude incredibly fast-growing plants.
Major Disaster from Toxic Crusaders could not only control plants of the organism variety, but, in one episode, power plants as well.
Wakfu: Princess Amalia Sheran Sharm and her whole race, the Sadida, have powers over plants, being themselves Plant People. They can put it to a great variety of uses, including battles by creating large and fast-moving cluster of vines to strangle or crush their enemies.
In Season 4, we also meet another nature fairy named Diana; she is one of the Earth fairies that was imprisoned by the Fairy Hunters.
Cornelia (who provides the picture of this page) and Kadma in W.I.T.C.H. can do this; it comes naturally with being the Guardian of Earth. Cornelia thinks this ability is lame at first (at least, compared to her earth-moving powers), but learns to love it once she is able to grow flowers the size of skyscrapers.
In both versions of He-Man and the Masters of the Universe, there was Evil Seed, a demonic Plant Person who sought revenge against animal life, and could command plants. In the updated version, however, he was opposed by Moss Man, a benign plant spirit with similar powers. (Evil Seed was as much a Large Ham as Skeletor; when He-Man asked Moss Man if he was always that way, the spirit just nodded and said, "Uh-huh.")