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Sorry to hear about your Habaneros Vetivert. I am convinced that peat free composts often have ph values that are far from ideal for tiny plants. Depending on what substitutes are being used. This could account for some seedlings perishing. We don't normally measure the ph of a bag of peat free compost, but maybe we should. A speedy repot in different compost may be worth a try for the remaining ones. An alternative would be to wrap the rest of the Habanero seeds well, put them in the freezer and start early next year.