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In my garden, this depends on the clone. Some bulk very quickly whereas a nice green-flowered Trillium chloropetalum I grow doesn´t develop more than three flowers since many years, for instance. Most of the hybrids clump well, the parents of this one were given as Trillium sessile ´Rubrum´ and albidum, the former being a somewhat doubtful name.
Trillium kurabayashii generally clumps well in my garden.
Saw mention of this article elsewhere and thought it might be of interest here: Toadshades of the Santa Cruz MountainsBy: Ray Colletthttps://www.pacifichorticulture.org/articles/toadshades-of-the-santa-cruz-mountains/?fbclid=IwAR2HDP7uscmact3fnJThjPYND-9BpYW-CnbsZBCJV7jVF8h2hGQc3IXiRqA
Most of the hybrids clump well, the parents of this one were given as Trillium sessile ´Rubrum´ and albidum, the former being a somewhat doubtful name.
Thank You, Leena! I just read that it takes well nurtured trilliums to develop the best colouring of the flowers. In former years I was slightly disappointed by the washed-off colouring of this hybrid´s flowers, which were no match for the strong pattern of the leaves. Nowadays I try to feed my trilliums every year, and now the colour of this hybrid has improved.
Trillium kurabayashii yellowTrillium kurabayashii yellow parents
@ Gabriela: I cannot smell any fragrance with this hybrid right now, but maybe this is because of the temperatures being rather low. We had some frost during the nights, down to - 3°C, but fortunately all trilliums escaped unscathed.In Germany, trilliums are frequently sold under wrong names, and few people try to verify the species. This hybrid and several others were raised from seed of two trilliums friends bought as Trillium albidum and sessile rubrum. The latter is a name errouneously applied to kurabayashii, which is hardly available over here - in most cases Trillium chloropetalum is sold as "kurabayashii". Judging from the white and reddish flowering hybrids I achieved from this seed, there must be a good deal of Trillium chloropetalum in their genes.