Flower Bed - Knowledgebase Question

Port Angeles, WA
Avatar for debb9
Question by debb9
February 7, 2001
I am building a raised flower bed and I want to lay down plastic to prevent weeds. How deep does the dirt need to be to allow the roots enough space to grow? I am also wanting to plant bulbs in this area.

Answer from NGA
February 7, 2001
If you're concerned about weeds growing up through the soil in your raised beds, I'd suggest laying down woven weed barrier cloth rather than plastic. The cloth will allow soil to drain - plastic will turn the planter into a tub and most plants do not like constantly wet feet. If you're planting flowering annuals and perennials, the soil needs to be only about 12-inches deep. If you're planting woody ornamentals, you'll need at least 18-inches and possibly 36-inches of depth. Bulbs will be happy with 8 to 10 inches of soil.

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