Tending Iris, Dahlia and Canna - Knowledgebase Question

kalamazoo, MI
Question by dfgquilter
May 23, 2006
I had to move some Irises lately, no choice. Should I heel them in a shady spot and plant them later on when it's cooler? I'm trying some dahlia tubers on the north side of my house. They will get a half day of sun. Is this a drastic mistake or will they take that amount of sun? Will cannas be OK in semi-shade? Thanks for all your help. This Q & A is the best thing since sliced bread!


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Answer from NGA
May 23, 2006

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First, thank you for the nice compliment! We like helping gardeners. Now to your bulb questions. Most dahlias like full sun, although protection from hot afternoon sun is okay. So, if they get at least 6 hours of sun in your northern exposure, they might perform for you. Canna, on the other hand, thrives in full sun. They love a nice hot summer! They do need consistent soil moisture, though. There are so many different iris with different exposure needs. If yours are sun lovers, I'd plant them now. Put a layer several inches thick of organic mulch around them to keep the soil cool and moist.
If you have the space, I'd suggest trying the different bulbs in a variety of locations and see where they perform best. Good luck!

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