In my 3.5e "Brotherhood of Rangers" game, I had an encounter with generic "vicious vegetables" grown by ogres.
Vicious Vegetables
Large Plant – Neutral
Hit Dice: 4d8+12 (30 hp) – CR 3
Senses: Blindsight 20 ft, scent, spot +1, listen --
Languages: none
Initiative: -1
Speed: none (no movement)
Armor Class: 15, touch 9, flat-footed 15
(–1 size, +6 natural)
Saves: Fort +7, Ref +1, Will +2
Special Defenses: Resist fire 10; Immune: electricity, sonic, poison, sleep effects, paralysis, polymorph, and stunning; critical hits, being flanked, mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects)
Weaknesses: vulnerable to cold, unable to hear
Base Attack/Grapple: +3/+12
Attack: 4 Tentacles +7 melee (1d6+7) each
Full Attack: 4 Tentacles +7 melee (1d6+7) each
Space/Reach: 10 ft./5 ft.
Special Attacks: Entangle (no save)
Special Qualities: blindsight, scent, plant traits
Abilities: Str 20, Dex 10, Con 16, Int –, Wis 13 Cha 9
Skills: none (spot +1 based on Wis)
Feats: none
Environment: wicked gardens & greenhouses
Organization: Solitary or patch (2-8)
Treasure: None
Advancement: 5–8 HD (Large); 9–12 HD (Huge)
Level Adjustment: –
Notes: Vicious vegetables look like a garden or container plot of ordinary vegetables (corn, squash, tomatoes etc.) but rustle with obvious (albeit mindless) animation. They cannot move from the plot where they are growing. They are repelled by the odor of ogres and similar creatures (e.g. hill giants), and will not attack or attempt to entangle them. Note that they can be easily fooled by ogre odor, even if the figure doesn’t look (or feel) anything like an ogre.
They cannot hear, and they can only sense light vs darkness, rather than being able to see. They attack by means of a “blindsight” that combines scent, the ability to sense air currents, and touch.
In combat, vicious vegetables can make four attacks per turn with their vines & leaves. (These are effectively “tentacle” attacks for game purposes.) The attacks count as both bludgeoning & slashing damage. They are limited to making one attack against a medium or smaller figure each turn - they get their multiple attacks only if fighting multiple foes.
They also get an entangle attack: They attempt (and automatically fail) to entangle opponents within 5 feet, but this still slows the opponents down to half move. They entangle fully vs figures that enter their squares with no roll to save.
