The Treesinger archetype from ARG uses plant form exclusively for its wildshape. The question is, is it any good? The last time I checked, most considered wild shaping into a plant to be useless, because there weren't any good plant shapes to assume. Now that there is a druid who only changes into plants, I am forced to wonder how useful the ability is.
Sorry, can't say anything about the Treesinger.
But in my opinion plants has been viable choices. While there isn't many bonusses, the 4 natural attacks of the violet fungus is quite good.
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Plant forms aren't much worse off than animal forms in basic combat; the primary issue with Plant wildshaping is that you do not gain access to the plants' special abilities in nearly all cases.
That means that frequently there is a more advantageous Beast or Elemental shape available to a core druid, because they have abilities that more frequently are found on the spell lists (Beast Shape 1, etc).
There are a number of really good Large plants available, like Viper Vine and Sargassum Fiend, but you can't turn into them until level 10 (blech).
If your GM lets you turn into a Mi-Go from Carrion Crown pt. 4 then it would be pretty good, they get 4 attacks and a fly speed.
The Alraune is kind of interesting for a sorcerer/wizard using plant shape II because they can speak and gesture like a humanoid, so they can still cast.
The tendriculos is the only wildshape form to have regeneration (10, so rather a lot of it too). That it is huge is probably no bad thing.
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I still don't know why the hell they limited the special abilities so much and picked the ones they did. They just plain don't match up at all with what typical plant creatures actually have. If they thought getting plant qualities was too OP, they could've just not made the spells / been more upfront about, "we're going to make this useless out of fear" than they were. Unless it was just pure incompetence, which...is probably the real reason.
For a fifth level spell it should at least grant bonuses to saving throws against effects that plants are normally immune to, like undead anatomy II (also a 5th levels spell) does.