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Here is my C. wattiorum. ibrahim
KrisI'm growing wattiorum in standart mix - 1 part peat moss + 3 parts coarse sand + dolomite chalk and watering with 0.2% complex fertilizer solution. I'm adding additional peat only for Crocus carpetanus. In summer are kept in same greenhouse where temperature can raise up to + 40 C. It splits, but blooms well and I didn't noted decreasing of corm size. At present I have 5 pots of flowering size + 3 pots with seedlings of various years. They got full sun. May be you need more fertilizer and longer watering to make season longer? We have quite different natural conditions with Holland.
Oh yes- quite the crevice plant! We have a Crocus (pulchellus) hybrid that has seeded itself in the very small gap ( 0.5cm) between two paving slabs on the terrace in our garden. I feel so sorry for the poor thing in such a tight spot!