Here are some photos I took over the course of about 6 weeks in my bog garden. A hail storm had severed a leaf of D. filiformis 'Florida Red' and as it lay on the damp gravel, it began to generate leaf sprouts! In only about 6 weeks they are as big as second year seedlings, and will be mature size, and probably even flower later this summer. Funny, though, when I cut off leaves and lay they out in similar places in the bog, then usually don't sprout. And if you just weigh a leaf down with a stone to the damp surface, it doesn't sprout either. The leaf has to be severed and find just the right conditions it seems.
The leaf sprouts grow to maturity much quicker than seedlings do. Now at the beginning of July the plants are all 4 to 6 inches tall and some are even putting up bloom spikes. But I tried cutting leaves and laying them nearby and all of them just rotted instead of persisting and making sprouts. The leaf spouts occurred once naturally in the bog garden both last year and this with the 'Florida Red' sundews and a few times with the D. tracyi form. But with D. tracyi there is rarely more than a couple plants that make it unlike the D. filiformis 'Florida Red' which can make a whole line of plants. So far, it hasn't happened with D. filiformis ssp. filiformis, but I do see it occur sometimes around older plants of D. intermedia. Right now I have pretty much every sundew species of Eastern North America, D. brevifolia, D. cappilaris, D. filiformis ssp. filiformis, D. filiformis 'Florida Red', D. filiformis 'Florida Giant', D. intermedia, D. rotundifolia, D. tracyi and even the hybrid between intermedia and filiformis, D. x hybrida.