MARK CULLEN: The Dirt on Spring Planting

We are approaching planting time: with many Canadians finally getting closer to the good spring weather that we have been waiting for.

This is your very best opportunity to build a foundation for your garden this year that will support plant life and grow –in reality – the garden that you have imagined all winter long. My advice is that you begin your spring planting by not planting at all, but rather, get into your garden with a sharp shovel or spade in hand and dig some holes.

You are not digging just for the fun of it – you are going to examine your soil to determine what needs to be added to it in order to grow a great garden this year.

Some helpful tips:

* Take a handful of soil and squeeze it in the palm of your hand, then bounce it around a few times.

-  If the soil breaks up in your hand, you have a pretty good start. Add lots of organic material in the form of finished compost from your composter or purchased from a reliable local source. If you are buying your compost by the bag, look for a good quality national brand like C.I.L., Green Earth or Hillview.

-  If you are purchasing compost by the cubic yard (i.e. truckload) make sure that you are buying from a supplier that has a solid reputation for quality. There is no sense going to all of the expense and effort to have it delivered (the easy part) and spread over your garden (the hard part) if it is second rate material.

-  If your soil samples do not break up in your hand, but stay in the shape of the soil that you squeezed, it is time to assess more closely: is it clay? If so, add generous quantities of sharp sand, otherwise known as play sand (but NOT beach sand!). This will open up the clay particles, which are so small that they bind together to form an impenetrable mass. Also add the compost – as described above.

-  If you are unsure of the quality of your soil (after all, you likely have a day job and chances are good that soil analysis is not a big part of it) then I recommend that you take it to a local hardware store or garden centre and talk to a trained professional. Someone who deals with soil issues often can tell you a lot about the quality of your existing soil and how to improve it.

-  If you have solid clay (e.g. you could make bricks or cereal bowls out of it) I recommend that you seriously consider removing it to 40 cm (15 inches) deep and backfilling it with 50 cm of triple mix (18 inches).

What is triple mix, you ask?

An equal portion of quality top soil, peat moss and finished compost (vs. ‘unfinished’ or ‘green’ compost).

I have pretty good quality soil in my garden, but I add 2 cm or one inch of mushroom compost over the entire garden every spring.  I just let the earth worms pull it down and convert it into nitrogen rich earth worm castings. This takes about 6 to 8 weeks, depending on rainfall.

If you are in a hurry or just enjoy the experience of digging, turn it under with a garden fork or small rototiller.

After you have your soil prep done, it is time to go shopping – almost.

Mark Cullen appears on Canada AM every Wednesday morning at 8:40.  He is spokesperson for Home Hardware Lawn and Garden.  Sign up for his free monthly newsletter at www.markcullen.com.