Answer: It is disappointing when the flowers you wait all winter for don't perform. The southern exposure probably did force your hyacinths along faster than normal, which may be why they didn't form stalks properly. Do the blossom buds/stalk appear brown and slimy? Then bacterial soft rot is the likely culprit. It forms on bulbs in wet soils or bubls that have been stored improperly. You may want to contact the source of the bulbs; since your soil is well drained, poor storage is the likely source of the problem. If soft rot seems to be the problem, dig and discard the bulbs and replace the soil since the bacteria will hang around. Excess fertilizer can make plants more succeptible to pests and diseases, so when you fertilize bulbs, use a mild one, suchas Burpee's Vitalize plant food. I hope this gives you some insights to the problem.
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