Lawn problem

Shade

Lawn grasses need direct sun. In shade they grow thin and weak, and under trees they also compete with tree roots for water.

Also called: Grass dying under trees, Thin lawn in shade

Short answer

Lawn grasses need direct sun, so in shade they grow thin and weak, and under trees they also compete with roots for water. Buffalo copes with the least sun of the common warm-season grasses, at about 4 hours a day. Mow shaded areas higher, reduce traffic, prune for light, and consider garden beds where grass won't grow.

Overview

Every lawn grass needs direct sun to grow. Some cope with less than others, but no lawn grass grows well in deep shade. Under trees there’s a second problem: tree roots take most of the water and nutrients.

If an area gets less direct sun than your grass needs, no product will fix it. The fixes are more light, a more shade-tolerant grass, less wear, or accepting that the spot is better as a garden bed.

Symptoms

  • Thin, sparse grass with long, pale leaves
  • Bare soil and moss under trees or beside buildings
  • Weeds filling the gaps

Possible causes

  • Not enough direct sun for the grass type: the main warm-season grasses need roughly 4 to 6 hours a day, depending on type
  • Tree roots competing for water and nutrients
  • Mowing too low
  • Foot traffic concentrated in shaded areas

Work out the cause

  1. Count the hours of direct sun the area gets on a typical day in the growing season.

  2. Compare it with what your grass type needs (see each grass type's Lawn Library page).

  3. Check soil moisture under trees after watering; tree roots often leave it dry.

How to fix it

  • Raise the mowing height in shaded areas.
  • Choose a grass type with better shade tolerance for that area, if replanting.
  • Ask an arborist about thinning the canopy to let more light in.
  • Water and feed shaded areas to make up for tree root competition.
  • In deep shade, consider mulch, pavers or a shade-loving groundcover instead of lawn.

Popular questions about shade

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Sources

  1. Turf varieties, Turf Growers Association of Western AustraliaMinimum direct sun: soft leaf buffalo 4 hours; couch 5 hours; kikuyu and zoysia 5 to 6 hours. Accessed 3 October 2026.