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D. imperialis: how to cultivate?

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Posted by linaria 7 (My Page) on
Sat, Mar 21, 09 at 16:56

Hello there,
today I got a tree dahlia as a gift. I have grown the regular garden varieties, so I know the essentials. Do I just treat it like a garden Dahlia? I plan to start it in a pot with a light soil mixture. So it has a head start and hopefiully survives the slug attacks after planting. The soil is a heavy loam. Should I mix in some sand or something like that to improve the drainage?

And is it likely that it flowers before the frost. I read in a book that it flowers at the end of the year.

Well, any hints are welcome. Thanks a lot,

cheers, Lin

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RE: D. imperialis: how to cultivate?

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You will have much fun trying to get the Dahlia tree to bloom before frost. Great idea to get an early start. I grew mine in half barrels of topsoil, sand and compost mixed. Fertilize as you would a garden dahlia, keep watered well and protect from slugs. The more sun and heat, the better.
In Zone 7 it's a real challenge to get long enough days and heat to get them to bloom, but I've had buds well formed before frost in October. Never a bloom this far north though.

Good luck trying! It's a marvelous, awe-inspiring plant to watch grow by leaps and bounds.

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