What I'm looking for is the faster of the non upright lace leaf species. I'd like to put something in my garden that will fill out the fastest, while still giving me the common Japanese lace leaf maple shape. If anyone knows this information, or where to look it up, I'd appreciate it.
While not all true red laceleafs, My Orangeola, Just put in 6-12 inclues on its second flush. (Its in a 3G container, maybe 24inches high.) Chantilly Lace, although got some tip-die back last year, has just but on substantial growth last year when I bought as a graft. It's ready for a 2G next spring. I am not sure what color it should be, but in morning sun/ afternoon light shade, it colors green with red tips. I have an Octopus that's held red all season and supposed to be fast grower, but as a 1G plant in morning sun only, its slow growing and seems pronw to get tip burn. My Tamukeyama's are hardy, but not fast growers for me. Same with Baldsmith but it burns easily (I do a lot of containers) and is more of a greenish dissectum. Probably not too helpful. I live in a Zone 5B close to ocean so more like a zone 6. In Maine on the Northeast. This summer has been hot and very humid. Almost all of these are in fairly thick containers, not liners.
I would say that, everything else being the same, a dissectum atropurpureum seedling will probably grow faster than a grafted plant (although I'm sure many will disagree with this). Then for the grafted plants, I can't tell a lot of difference in intrinsic growth rates among the most popular and vigorous cultivars like Tamukeyama, Inaba Shidare, Crimson Queen,... Type of soil, watering, feeding,... will certainly have a greater impact. Gomero
Some nursery people here prefer 'Inabe shidare' as a fast growing red dissectum. As Gomero mentioned, the dissectum seedlings may be faster growing , A. p. diss. Viridis would be a green one.