NEIGHBORHOOD GARDEN FOR MARCH 12, 2016
************************************************************* DO YOU
MULCH? BY
GLADYS JEURINK
Several of my Master Gardener friends take care of yards for
other. As we talk I hear a common word, “mulch”. What does it do? Here
in Nebraska where it often becomes hot and dry, it becomes more and more
important, especially when we have the threat of water rationing.
My favorite mulch is small bark.
I find it easier to walk on and to drive my wheelbarrow over.
There are also smaller spaces for weeds to escape from below so several
inches prevents their sprouting or doing well. The soil will keep its
moisture longer as well as keeping it cooler.
If you have a ring of it around your trees, you are less likely
to scar that trunk with your lawn mower.
So what do you use and how do you mulch?
Most gardeners I talk to say 2 to 3 inches is enough to do the
work and let the rain get through. More than 3 to 4 inches does not let
air down to the soil and to the roots of your plants. You will need to
add more each spring as it breaks down and becomes part of your soil.
Grass clippings contain nitrogen fertilizer but they can smell badly and
let water run off. When I use it, I like to put it under my bark chips.
Mulch can also prevent splattering of mud on your leaves. Be
careful about putting mulch up against your plant stems or you can cause
rotting. Instead leave a
ring of an inch or so away from the stems.
So what do you use? It will depend somewhat on what you like to
see! Peat moss gets dry and causes run off so I never use it for mulch.
But it can be mixed with a coarser material. Acid peat is quite often
used to lower the pH in AZALEA’S, RHODENDRONS, and BLUEBERRIES. My soil
usually tests about 7.2 (slightly alkaline) while many of my plants
prefer 6.5 to 7.0 (neutral). You may have heard that pine needle mulch
will acidify the soil. This is true only of fresh ones. Sulfur granules
are my favorite additive to lower pH but it has to be done again and
again. You can get a pH soil tester to check your soil. If I want acid
soil in my pots, I fill them in the fall before, add soil, then add the
granular sulfur, and mix well so it will be ready by spring.
There is also Miracid fertilizer (and other brands of acid
fertilizers) you can get for your house plants.
Mulch can also increase the organic content of the soil (humus)
which is desirable. So what do you choose? Straw has little food value.
Sometimes I put a light layer of nitrogen fertilizer down under straw
mulch to feed the plants until the mulch breaks down. Leaves that have
been ground up by a grinder or by your lawn mower work very well as
mulch and also have food value when added to the soil. Do not use leaves
on top of the soil that have not been shredded, as they tend to mat and
the water runs off.
Organic mulches such as manure, bark, and compost are very
desirable. When you add compost, if you have a good worm supply, they
will find the compost and take it down deeper in the soil as it goes
through their digestive system and then deposit the “worm castings” into
your soil and aerate your soil at the same time. A number of gardeners
here in Lincoln get compost from the city landfill and use it as mulch
as well as fertilizer.
Mulches of gravel and sand are used in rock gardens or around
plants that are sensitive to water on their leaves. In pots this also
done as a decorative effect. I also use it to prevent water from
splashing on my leaves when I water.
Mulch should be long lasting, and not easily be moved by rain or
watering, as well as being loose enough to allow water to get through. I
like compost because of its food value but its light and washes away
easily so a thin (one inch) of compost just under my bark chips works
very well. Copyright 2016 |