The case against commercial garden soil and mulch

I have learned over the years that commercial (sold in bags or delivered in loads) garden soil and mulch are not the most efficient products to improve the quality of soil in your garden beds.  Every time I have done so, I end up with more weeds in my gardens…

So, if you shouldn’t use the commercial garden soil and mulch in your gardens, what should you use?  Instead of the commercial garden soils and mulches that are available in bags from your local garden center or delivered in truckloads, I currently use the following plan.

In the fall I use shredded leaves as a mulch throughout my gardens, then in the spring, I spread composted manure around all my emerging plants.  Be sure to use well-composted compost or manure in this step to avoid stinking up your neighbourhood. The extreme heat levels in the composting process kills weed seeds too, so is very important.  You could use your own compost pile, but ensure it has matured to the weed-free level.  For large volumes, I use a variety of composted cattle/steer manure, available at my local Home Depot, particularly because it does not smell bad.

This process adds both nutrients and humus to my existing soil, improving its quality immensely.  The proof is in the beautifully healthy-looking plants and lack of weeds!

Polymeric Sand Replaces Weeds

paving stones with moss

Gardens4u started a project recently in which the client wanted her yard restored to its full potential.  Landscapers were paid a hefty sum to make it beautiful years ago, but the interlocking walkways and patios had since been overtaken by weeds. The pictures below do not give the weeds justice for their size and number, unfortunately, I forgot to take a real “before” shot.  

Our job was to remove the weeds and fill the cracks between the interlocking bricks with polymeric sand.  There is a specific and somewhat finicky procedure to using this product, but it works well. Patience is the key.

The cracks were cavernous in some places, with nothing in them.  There were mud, moss, and weeds in every imaginable space.  

After many hours of power washing, my son had the interlock pathways and patios looking like this:

polymeric sand after powerwashing

Polymeric sand was added to make them look like this:

polymeric sand

We still have a few days of work left, but the progress is amazing! This process should keep the weeds at bay for a while.

Unfortunately, this yard always seems to be windy, so persistent weed seeds will settle in the cracks eventually and new weeds will emerge. Hopefully, new weeds will be kept under control though.

Spring Cleaning your Gardens and Lawn

spring cleaning

Just like the inside of your home, your gardens and lawn will benefit from a good spring cleaning too. As soon as the snow disappears from your lawn and garden you can start the spring cleaning.

Spring Lawn Care

When your lawn is dry (not spongy to walk on) give it a good rake to remove all the dead grass and leaves. Core aeration is recommended after raking to allow oxygen and nutrients to penetrate into the root system of your lawn, especially if your soil is heavily compacted.(as most lawns are in this area) Core aeration is also effective in the fall, one less thing to do in spring.

If your lawn has a lot of crabgrass and broad-leaf weeds (dandelions) you can treat it to a weed and feed product.  The ones containing corn gluten are particularly effective if used before the weed seeds have a chance to germinate.  I sprinkle corn gluten right on the snow when there is only a small amount of snow left on my lawn because as soon as the snow is gone, the weeds start to germinate and within a few days the crabgrass growth is visible.  

You can also overseed your lawn now (but only if you have NOT applied something for weeds, otherwise wait 6 weeks to seed) by raking in topsoil and sprinkling grass seed on the soil.  This is best done before a rainy spell as the seeds should be kept wet until they germinate.

Clean Debris out of your Gardens

Your gardens can also use a good raking early, but be sure to use a plastic rake and a gentler touch, so tender dormant perennials are not damaged.  Remove all the dead, but still intact leaves, last year’s annual (annuals are plants that you must replant each year) plantings, and the twiggy pieces of last year’s growth on the perennials (perennials are plants that come back on their own each year).  Generally speaking, if the twiggy pieces break off easily with a gentle rake, it is safe to remove them.  

Woodier perennials (lavender, sage, hibiscus etc) need a bit more time to rebound from winter and should not be cut back until new growth is visible. Spring cleaning on those fussier perennials should wait.

Prune Shrubs, Divide and Plant Perennials

Shrubs that bloom in summer or fall (weigela, pink spirea, burning bush etc) can be pruned in early spring, while those that bloom early in spring (forsythia, lilacs, magnolia etc) should not be pruned until after they bloom.

Dividing perennials is best done this time of year too; dig up the overgrown clumps, divide them with a sharp spade, and plant them in their new locations.  Fill in bare spots with new perennials. These jobs can be done as soon as the ground thaws.

Annuals, however, should not be planted until the danger of overnight frost is gone, usually late May in this area.

Amend Your Garden Soil and add Mulch

Once all of my perennials have re-emerged, the weeds and old annuals are removed, and the necessary pruning is done, I like to amend the soil around them with soil, compost, and peat moss. This triple mix product can be purchased already combined.  

A layer of cedar mulch (I prefer dark brown or black) is the final touch, but to prevent your plants from rotting, be sure not to apply the mulch too close to the base/stalks/stems of the plants.

Finishing Touches

The last step in spring cleaning your gardens is to retrieve the outdoor furniture and whimsical touches from their winter storage. Then enjoy the most important part, take a few minutes out of your busy life to sit down, relax and admire your efforts…