Ground Covers: Scorch

Problem
Tips and edges of the leaves are brown and dead. Leaves may fall.

Analysis
Leaf scorch may be caused by any of a number of conditions.

1. Heat scorch: In hot weather, water evaporates rapidly from the leaves. If the roots can't absorb and convey water fast enough to replenish this loss, the leaves turn brown and wither. This condition is often seen when shade-loving plants receive too much sun.

2. Winter injury occurs on plants growing in full sun. On a clear winter day, the sun heats the leaf surface, increasing the need for water. If the ground is frozen, or if it has been a dry fall and winter, the roots can't absorb enough water.

3. Salt injury results from excess salts in the soil. These salts can come from irrigation water, de-icing salts, or fertilizers. This condition is worse in poorly drained soils, where salts can't be easily leached.

Solution
Follow these guidelines to prevent scorching.

1. Keep ground covers well watered during hot weather. For a list of sun- and shade-tolerant ground covers, see Ground Covers for Sunny Areas.

2. To prevent winter scorch, be sure the soil is moist before the ground freezes. Provide shade during clear, cold weather.

3. Leach the salts from the soil with very heavy waterings. If your irrigation water is salty, leach regularly to keep salt from accumulating in the soil. When you fertilize, apply only the amounts recommended on the label, and water thoroughly afterward. For more information about salty soils, see Salty Soil.