Here an excerpt from the email...
Because it comes as of yet and when losses in the great outdoors, I cultivate the plants in pots. If you prefer the culture in the great outdoors, you should choose a half-shady site is protected especially in the spring from too much water. The tubers should be planted rather deep, at least. 20 to 25cm deep. Only at the supplied size I would advise for the time being to a lower depth. Under the tubers may be to a drainage layer of coarse gravel or brick chippings etc..
The tubers grow every year, a good supply of nutrients is important, so is good to fertilize. With us in the great outdoors, this type is sufficiently Hardy in sufficiently deep planting. Essentially, not the temperatures make the problem, as a rather wet!
I use square plastic container to pot culture 13 cm x 13 cm. I use a traditional high-quality potting soil, which I set to the better ability to pour some sand as substrate. This can be done also with perlite, vermiculite, Seramis etc., but also works without surcharges. Carefully, it should be started with the casting as soon as the new drive reaches the surface of the substrate. First appears the bloom, the sheet, which should be obtained until the autumn green appears at the end of the flowering season. Fertilize again during this time, I use the time fertilization also Osmocote. Especially in the summer to make sure that the pots never completely dry out. This should happen, never by watering try this sheet again to fix: only the tuber is lazy off by too much water! In this case, bring the plant into the dry resting period!
In normal course, the leaf stays green until about September. If it is yellow stain begins (cold nights), stop pouring and bring the tuber / pot, dry and frost-free over winter. In the spring, the plant begins very early shoots, may already be in the January / February. Always check the pots.