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I planted a few dozen ordinary snowdrops some years ago and planted them in November, and not one appeared the next year.
I have accidentally lifted snowdrops in July, 22nd, that already have excellent roots
Here the cold may also come in November, but I have planted dormant snowdrops in August or early September, and they have all done well. Two or three months have been enough for them to form roots. I have understood that snowdrops start to form new roots at that time after the summer rest, but I don't have a lot of experience yet. One snowdrop I planted last year in October and in the spring it formed untypical flower with very short stem, I think someone said that it was most likely because it had not had enough time to root.
I really don't think that a dormant bulb planted in September is established in January even if it has nice roots.
How about this for an explanation. Snowdrops don't experience a dormancy during winter (or even at any time, as far as I know). The bulbs may have enough stored energy to flower, but not to survive the whole winter. In order for them to survive they have to photosynthesize, and this means being able to produce cryoprotective sugars by pulling water from the soil. Even with roots, if the roots have not come into contact with the soil to a degree sufficient to allow them to pull as much water as necessary, leaves are damaged after experiencing cold. So, in other words, you're right.
I believe that the decision about when is the best time to move/plant snowdrops should be determined by experience in the climate/garden where you are doing it and not by hard and fast rules.
Lovely day to spent in the garden, with the sun making the flowers go open Lord KitchenerRosieIvy Cottage Green TipGlenorma
My experience in the mid-Atlantic US over a long period of time with thousands of snowdrops is that spring planting is best especially if the snowdrop is fall-blooming or generally early blooming. What is your experience in Denver?