Kale is a very hardy plant to grow in the vegetable patch and is a ’must’ if you haven’t already considered it. It grows best during the cooler months and is very frost tolerant. But get it started in Autumn, you will then be able to enjoy your harvest for quite a long period of time - certainly through the following winter.
Kale is very high in a large range of vitamins, minerals and antioxidants. For this reason, it is considered to be a “super-food”.
In order to take advantage of the best growing and harvesting opportunities for Kale, it is best planted as seedlings or starters in early autumn.
Like all brassicas, kale is susceptible to Club Root. To minimise the risk of this, ensure that you sweeten the soil with some dolomite. Also, the soil should also be prepared with some blood & bone, compost and well aged manure. Nitrogen is critical to leaf development, and unlike brassicas such as broccoli and cauliflower, it is leaf development that you want. Well aged chicken manure is a good source of nitrogen.
Kale does require regular watering, but take care to not overwater it - nice moist soil is optimum, but not “wet” soaking soil. In addition to this, you should mulch around the base of the kale in order to minimise water loss from the soil, protect against heavy frosts and prevent the growth of weeds.
There are several pests that affect kale, but the one that you will need to be most vigilant for is the White Cabbage Moth. This moth lays eggs from which caterpillars that are sometimes referred to as Cabbage Worms emerge.
Each of the following articles describes some good methods for dealing with the cabbage moth pest …. however, preventing them from laying their eggs is by far the best and safest:
Basically, you can harvest kale leaves at any time. Select leaves that are a size that are suitable for your needs - probably around 20 to 30 centimetres long. The main rule is to ensure that you select lateral leaves and not those from top of the plant - this is the growing section of the plant. Picking leaves at the top will significantly reduce what that plant will provide you with for the season.