Survival rates are close to 100% of the young small hard tubers under 1" size, which incidentally if they have a single sprout are likely to sprout a single blooming plant.
Those can go on to form large conglomerate tubers, large old tubers, or multiple young tubers given favourable tubering conditions
Tubers with a lot of sprouts tend to self crowd and not fire up to blooming size plants
Larger tubers may well be old, on their last legs and the mass of starch within them about to rot in marginal conditions
Rhisomes of tropical waterlilies tend to be soft celled and easily rot if they don't get growing temps daily
Grown out plants with no tubers or rhisomes formed can be kept going in borderline temps though they take up a lot of space.
Plants which are outdoors hardened are going to be considerably more durable and cold tolerant than soft cell plants that have been pushed in tropical or climate controlled conditions
Folk that have pre concieved notions based on what hardy waterlilies are like, for example taking for granted large rhisomes or grown out plants are somehow better than smaller ones are likely to end up with either invasive messy plants with poor pad to bloom ratios, or struggling with plant shock
Young small tubers are durable in marginal conditions, go from dormant to blooming in a month and display pristine growing habit
Regards, andy
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