Good question, and I love that you are familiar with Holst's book! Such a useful reference guide. So the species will go dormant every year, some with shorter dormancy than others (e.g. Red Zone species). What can happen is that the plant will delay dormancy until an awkward time (e.g. the growing season), which messes up the cycle so you might get a reduced growing season, thus negatively affecting the size of the bulbs and the quantity/quality of the blooms. Additionally, if you water when the plant doesn't need it, the risk of rot greatly increases in cold weather (<55 degrees).
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