Here's how I feel I'm going to take care of it.
The native plant life doesn't have sensory organs, so their knowledge in their environment would be restricted to just about just contact and temperature. And abnormal plants would not have an intelligence, knowledge, or air of secrecy score, so despite the fact that it could collect a little bit of information about its surroundings, it wouldn't be able to reason why, interpret, or influence it.
So with that during thoughts, using speak with plants on bizarre plants could be a lot like checking a climate software. The plant would give data, however the druid would have to interpret it. Something like this:
Druid: (casting spell) "Rose bush, tell me what you know."
Rose bush: "Current time: mid afternoon. Sunlight, temperature, and moisture normal for the season. Recent limb loss due to light pruning. Two flowers in full bloom were recently removed."
Druid: (turning to the rest of the celebration) "The gardner was here today."
I believe that is lovely fitting of a first-level spell.
Now, if the plants have been intelligent and able to reason, I may move a little additional...
Druid: (casting spell) "Braeburn, tell me what you know."
Braeburn (Treant): "Welcome back, my lady. Three men came by while you were away; they knocked thrice on your door and called for you, but left after you didn't answer. I think they were friends of yours. They took my best apple, I'm afraid...I was saving it for you."
Druid: "Thank you, Braeburn. You will let me know if they return?"
Braeburn: "Of course, my lady."
Yeah, I like that.
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