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Cup Plant Cup Flower What Is This Plant?

Ask the Expert: need the name of plant/patio type nurseryman in southeast Texas called this plant a cup plant but I don’t believe this is correct. Plant height is around 16″ mature, has a woody, branching habit, and bears white or yellow flowers resembling a small 1 1/2 inch primrose or potentilla flower. the leaves are dark green and are very similar to a penta. I was told it will propagate via harvested seed. Donna

Reply:

Cup Plant Silphium perfoliatum

Cup Plant Silphium perfoliatum

I think you are probably right it doesn’t sound like cup plant (Silphium perfoliatum) which is shown to the right. I found a picture of cup plant on the Connecticut Botanical Society website. and its minimum height is 4ft.

It could be a form of Nierembergia which is sometimes called cup flower.  However, the white flowering ones don’t grow that tall.  Do you have a picture of the plant? I could probably make an identification from the picture.

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