I'd like to make a sentient plant species that can perform tasks such as communication and problem solving.
My Definition of Sentience
When asking this question, I mean sentient as in able to rationalize and solve problems without solely relying on instinct. I believe there are two levels of sentience. The first is animal level sentience, which is basically where they are able to communicate and socialize on a low level and have simple emotions. The second is human level sentience. Our emotions, thoughts, and social lives are extremely complex compared to animal's. I am looking for the human level sentience in these plants.
What I Already Know
I know that technically speaking a plant is a life form that uses photosynthesis to produce food for itself in order to survive (though other life forms can do photosynthesis too). That's about it. I am not a botanist.
What I'd Like to Know
I'd like to know how this hypothetical species could fit my definition of sentience (I'd also like for them to be mobile, but it's not a must) while still technically being considered a plant. (please note: I am not wondering whether or how a plant could develop sentience, this question is more about whether a sentient plant is still a plant while being intelligent as a human)