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Herman, I have a warm, fairly sheltered, sloped south-facing garden. My garden is too hot for undulatum so I grow it in a pot kept in a shade frame. The compost is a free-draining mix of silica sand, granite grit and Scots Pine needles/leaf mould to which I add some finely chopped sphagnum moss. This mix is VERY acidic. I only water with rainwater/RO (reverse osmosis treated tap-water) water and add 10ml cider vinegar to 1L every 2nd/3rd watering. The plant is seed-raised from Canadian seed bought on eBay some years back. Germination was poor and the seedlings dwindled over the following years as I didn't know what conditions they liked. Eventually I was left with one sickly young plant. I gleaned some info from the internet on how to grow undulatum and so altered the compost and watered as above; the plant has since gone from strength to strength. Though still a small plant it has two growths this year.I am no expert but I think that the important issues are a free-draining mix and maintaining a very acidic compost (pH <4.5). A very acid compost limits decomposition of the organic content in the mix which helps preserve the compost structure/free drainage and suppresses pathogenic fungi.Of course it is possible that all of the above is nonsense and I have simply enjoyed beginner's luck.
Beautiful pictures Steve! Tr. lanceolatum is that the same as Tr. lancifolium?
Steve, I donīt know at what to marvel more - Your exquisite trilliums or Your outstanding pictures!