MULCHING Although there is a growing list of materials from which to choose, including bark (at least 3 different grades: fine, mini, medium), rubber chip, coloured wood chip, stone/pebble, slate, glass etc, it is probably fair to say that bark mulch is still by far the preferred top dressing for planted areas.
But how much and how often does one apply mulch? The recommended depth for a mulch dressing is 30mm-50mm (approx 1-2 inches) which is generally applied to all newly (as well as established)planted areas.
Bark mulch being a natural product will decompose over time, faster in drier weather and blowing around during windy spells.
Although it can and does look very smart on planted areas it doesn't last forever and annual top ups are necessary.
Avoid over doing the depth, too much is likely to cause problems for plants, excess moisture in poorly drained soils, reduce oxygen levels in soil etc Less is more and if you stay within recommended levels, good moisture retention and weed control can be achieved.
When to apply - plan to top up on an annual basis, but avoid applying mulch too early, ie, avoid the risk of trapping excess moisture in soil which will cause problems for plants.
Wait until the very wet spells have passed and the soil has had a chance to dry ou.
Apply in early May or early June.
Apart from planted areas, mulch can be very effective around specimen trees and shrubs, provide good definition of ring beds at base but also helps to prevent grass encroaching around stem and subsequent risk of damage by strimming or mowing etc.
Why not make your own compost to add to your mulch dressing, not only will it reduce the cost but also add valuable nutrients to the soil as well as help to improve the overall aesthetics.