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Geranium Maderense
I've grown the plants from seed. They are now 2 years old, look very healthy but no soigné of a flower. Different locations in the garden, one sunny and dry and the other part shady and damper. Bought seed from Trebah garden, Cornwall.
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It is tender up here. I bought a seedling in penzance, and I was told to put it in a big pot, and feed it. It flowered the second year.
Try feeding it with a high potash fertiliser like tomato food.
Spectacular in flower, especially when backlit with a setting sun.
Of course , being monocarpic, they then die, so don't forget to save the seed.