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Bulbs in Window boxes?

Northfield, MN(Zone 4a)

I'm in Z4a and am planting bulbs for the first time this year. Most of them I've planted in the ground, but I'd like to put some tulip bulbs in my windows boxes to enjoy outside my window this coming Spring. My question is this: will they freeze in the window box? The dirt is just about 6 inches deep...but that means there's barely an inch of dirt underneath them. Is this a bad idea?


Leesburg, FL(Zone 9b)

I would think they would need more protection from the hard/cold winter.

Hopefully someone who knows for sure - will pop in.

Merrimac, WI(Zone 4b)

I agree with tcs.

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