Potatoes

Potatoes, actually modified stems, are an exciting crop to grow because of the ‘earthing up’ cultivation required. So-called ‘new potatoes’ are the earliest harvested potatoes and are smaller than later varieties.

Potatoes for a Garden in a Term

Rocket

New Potato ‘Rocket’ is considered a very reliable variety. Purchase ‘Rocket’ tubers as early as possible in April. Tiny shoots will be showing at one end. Place the tubers in an egg box or shallow seed tray with the tubers’ ‘shooted’ end up. It is important to place the tubers in a bright spot indoors to achieve thick, healthy green shoots up to 3 cm long.

Growing Conditions

The soil in which potatoes are grown is also important. Wait until the soil is warm to plant potatoes outdoors. To test the soil temperature, push your hand into the soil. If it feels cold, wait to plant until the soil feels warm to the touch. Ideally the soil should also be slightly alkaline, that is, with a pH value slightly higher than 7. A simple pH test kit can be obtained at most garden centres. Potatoes also benefit from the incorporation of well-rotted compost, which will help to maintain moisture during dry periods. The compost will also slowly release essential nutrients throughout the growing season.

Cultivation

Planting and caring for potatoes is an interesting process. In general, new potatoes should be planted about 10-12 cm deep and about 30 cm apart in rows about 45 cm apart. Loosen the soil either side of the rows so that the soil can be ‘earthed up’, or drawn up, around the potatoes as they grow. This will aid in drainage and prevents the tubers from turning green. Green tubers contain toxins and should not be eaten. ‘Earth up’ the soil to a 5 cm soil depth when the potatoes’ shoots are 25 cm tall and then to a 10 cm soil depth a few weeks later. The potatoes should be watered thoroughly every 10-14 days during dry spells.

The first potatoes will be ready to harvest as the shoots begin to flower, in about 10 weeks. Simply lift the potatoes from under the soil using a garden fork.