Since organic farming eschews the use of pesticides, plants need to be protected from insect pests in other ways so as part of a multi-faceted approach to achieve that, the final step of transplanting, once seedlings are in the ground, is covering them up.
Covering the rows of plants to protect them from predatory bugs is a common technique used in Canada. Depending on the material, row cover can also provide insulation that protects against frost and increases soil temperatures; particularly beneficial for heat loving plants such as tomatoes, eggplant and chillies.
Setting up the row cover involves a few basic steps:
- Cutting wire or tubing that is rigid enough to drape the row cover over into regular pieces that will be long enough to span the plant beds.
- Pushing the wire or tubing into the ground on either side of the planted rows at regular intervals (5-7 feet or 2-3m) so they look like hoops sticking out of the ground.
- Cutting the row cover so it’s a little bit longer than the bed that needs to be covered.
- Pulling the row cover over the wire hoops ensuring it’s fairly taut.
- Securing the row cover at either end of the bed and on each side of the hoops. This can be achieved using rocks, soil or bags of either and is the most tedious part of it all.
This was our method for any transplants from the greenhouse but for plants that were directly seeded it was much quicker; there’s no need for hoops since the plants lift the cover as they grow.
Any material used as a protective cover for plants; there are different weights and grades available in a variety of widths and lengths. At Chelsea Gardens we used two types, both lightweight synthetics; the majority of it was referred to as row cover with the second type known as protectnet which is more robust, more expensive, doesn’t insulate as much and looks sexier since you can actually see the plants through it. In the pic to the right the row of transplanted pak choy on the left is under hoops with protectnet over the top while the direct seeded turnips, radishes, mustard greens and arugula or rocket are under row cover simply laid on top of the earth.
Unfortunately row cover is typically made from petroleum products and although the materials can be reused they are fairly flimsy and easily damaged but still seem to be the best solution given insect problems and the short growing season. The only other idea I had for something equivalent would be silk which would be stronger but could be equally light weight and prohibitively expensive.