Anyone know why Plants are immune to polymorph?

[Movin]

So I'm playing a Plant type creature in a PbP game here, I was just affected by a polymorph spell.
By the Plant traits i'm immune to polymorph even though there is a whole line of spells for turning into plants and polymorph any object can turn a raven into a writing desk.

Is it explained anywhere why plants are universally immune to Polymorph effects? I tried some Google-Fu but came up with nothing.

[Torbyne]

I think it may be based on plants generally lacking a sentient mind and soul maybe?

alternatively pro and anti arguments could be made based on the old, "It's magic, ain't gotta 'splain it."

[LazarX]

Movin wrote:

So I'm playing a Plant type creature in a PbP game here, I was just affected by a polymorph spell.

By the Plant traits i'm immune to polymorph even though there is a whole line of spells for turning into plants and polymorph any object can turn a raven into a writing desk.

Is it explained anywhere why plants are universally immune to Polymorph effects? I tried some Google-Fu but came up with nothing.

Because the rules say so. Presumably so that there is at least one class of monster that's immune to polymorph shennanigans. Just like almost every broad strategy has at least one wall it can't bulldoze through.

[Gobo Horde]

Well I posted this in the discussion thread for that game, but its worth repeating here :)

Beast wrote:

Well Greater polymorph actually only turns you into a psudo-plant, it acts as Plant shape 2 which gives you the appearance of a plant and a few abilities, but does not actually give you plant immunities :)

As for why Plants are immune to polymorph, they are considered objects, not living creatures. Plant creatures are kind of that corner case where the developers wanted them to retain their object-like qualities, but mostly count as creatures.
When you want to polymorph an object you usually use transmutation spells that dont have the polymorph discriptor, a few examples: Fabricate, Transmute Mud to Rock, or Transmute Metal to Wood

one noted exception (and Im sure there are more) is Polymorph any Object but that spell has to take into consideration ALL targets.

Edit: one more note on Polymorph any Object, It also makes allowances within the spell for objects, specifically calling out the ability to transform objects, and the ability to transform living into non-living and vice versa, which is something you normally wouldnt be able to do (specific vs general).