Growing hardy vegetables in changeable spring weather

During the period when night temperatures remain low, early planting of heat-loving plants can ruin all the work done. However, there are many hardy crops capable of active growth under such conditions.

Cabbage prefers fertile soil and full sun; the purple hue of its leaves indicates a nitrogen deficiency, which is corrected with organic fertilizers. Kale grows similarly and matures quickly for consumption. Broccoli produces new shoots after the main head is harvested, while cauliflower requires protection from the sun by covering the top with outer leaves. Lettuce is suitable for sequential harvesting and grows well both in soil and in containers. Spinach, chard, carrots, and parsnips are also suitable for early sowing, with root crops best placed in beds after leafy crops, avoiding excess nitrogen. Onions, garlic, herbs, arugula, chicory, and other crops are available at garden centres.

Tomatoes, peppers, chillies, cucumbers, courgettes, and pumpkins can be grown in protected soil — under covers, in greenhouses, or pots. In temperate coastal climates, planting them in open ground is safer in late September, while in cool and inland regions, it is recommended to wait for Labour weekend, guided by stable night temperatures above 10 °C. Beans will rot if planted in cold soil.

Growing success begins with tillage: thorough weed removal and the application of quality compost, poultry manure, sheep manure pellets, or organic fertilizers are required. Lime is applied annually to maintain a slightly alkaline soil reaction. Tomatoes, cucumbers, and peas develop effectively in containers, requiring regular irrigation and frequent top dressing in small doses.

The author of the material is Gareth Carter, general manager of Springvale Garden Centre in Wanganui.