How do I care for my astilbe plants in my house?

Irma
by Irma

I ordered astilbe plants from Michigan Bulb Co. to be planted in fall, well when they arrived it was to cold to plant them in my garden, I live in Minnesota. I planted them in a planter, now that they are growing they are getting about 4-5 inches tall, I thinking they will be just be tall and thin-punie looking and not the way they are suppose to grow when outside, what do I do- any sugestions? thanks for your help.

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