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CAn I say,

(a) She is planting a pot of flower.

(b) She is planting a pot of plant.

(c) She is planting in a pot.

(d) She is planting a plant into a pot.
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Vincent TeoCAn I say,

(a) She is planting a pot of flowers.

(b) She is planting a pot of plants.

(c) She is planting in a pot.

(d) She is planting a plant into a pot. Okay, but bad style. I believe a gardener would say "she is potting a plant" even though most people don't think of "pot" as a verb.

Also: She is putting some flowers/plants in a pot.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
If I say,

(a) She is planting a flower in a pot. (is that correct?)
Yes, that's okay too.