Hi,
can't be of much help really....I have just sown m/g seeds in the greenhouse, and intend to grow them in there as a showpiece. If you say yours always grow spindly, I wonder if 'pinching them out' in the early stages will help, to make them more bushy, as done with sweet peas and fuschia's. If you are really down in Berkshire , our gardening climes are quite different!
No experience of trilliums I'm afraid, but they do look nice.
Try a 'google' on them, I am sure you will find some advice somewhere.
I go to www.gardenerscorner.co.uk for advice...someone will know the answer there! Happy gardening!
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