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How to Increase Drainage in a Flower Bed

If the soil in your flower bed drains slowly, it most likely contains a lot of clay. This type of soil typically remains soggy and full of puddles for six hours or longer after a heavy rain. Some plants thrive in this type of environment, while others suffer because their roots don't get enough oxygen. The key to improving drainage in heavy soil is to add organic materials that separate the clay particles, allowing precious air in and improving the flow of excess water out. Of the two best methods, the first one requires less physical exertion but takes longer. Both methods are best performed in fall, before the rains begin.

Things You'll Need

  • Rototiller, cultivator or mattock
  • Coarse sand
  • Compost
  • Wood chips
  • Grass or legume plants or seeds
  • Pruning shears, loppers or machete
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Instructions

  1. Less Work, More Time

    • 1

      Cultivate the soil to a depth of 12 to 16 inches. Crush large dirt clumps. If the soil clumps excessively, lay the clods on top of the soil for a day to dry them out completely.

    • 2

      Till 6 inches of coarse sand – also known as builder's sand – and 3 inches of compost into the soil. Do not use fine sand as it may turn the clay soil into a cement-hard mass.

    • 3

      Spread 8 inches of wood chips over the amended flower garden soil. Water the area to a depth of 20 inches.

    • 4

      Allow the wood chips to remain on the soil over fall and winter. Either till it into the soil in spring or leave it as a mulch for spring flowers.

    Quick, But Labor Intensive

    • 5

      Use a mattock or rototiller to break up the top 10 inches of soil.

    • 6

      Spread 1 inch of compost over the area and rototill it into the soil. Spread another inch and rototill again. Repeat the procedure with 1 more inch of compost.

    • 7

      Plant grasses or legumes, or both, in the flower garden. Rye, oats, crimson clover or hairy vetch work well.

    • 8

      Cut the cover crop to the soil in spring when you are ready to plant. Use pruning shears, loppers or a machete, depending upon how heavy the crop is. Rototill the plants and cuttings into the soil.

    • 9

      Repeat the process each fall.