The Q&A Archives: Flower Bed

Question: 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: 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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