While selecting a mulch that does what you want is important, applying mulch at the right time and in the right way is equally important. So, let's take a look at the best times to apply mulch for the best results.
Mulch can be applied multiple times. You want to make sure you mulch at the right time as mulching too early can delay drying of soil. This is problematic to the subsequent root growth which is dependent upon sufficient aeration (oxygen content in soil) and reasonably warm temperature in the root zone. Mulch is usually applied first in spring after the soil has warmed and begun to dry from winter rains and snow. Depending on soil texture, temperature and other weather conditions, this is usually mid to late spring. So, when you mulch will depend on where you live, for example, in seasons and areas of more than ample rainfall and/or cool temperatures, mulching should be delayed until late May or June.
A second application is often needed in autumn. If your plants are already established then the timing of the mulch application may not be as important as it is on new plantings. New plantings of things such as shallow rooted shrubs and evergreens, herbaceous perennials, or strawberries need to be mulched at the right time to get proper growth. Because heaving of small plants, especially those newly planted, occurs following alternate freezing and thawing of the soil, apply mulch following the first indication of frost in the ground. Mulching slows the thawing cycle and thus heaving. For established plants, water thoroughly in late autumn if the soil is not already moist, then mulch.
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