GROWING AN EDIBLE TUBERS
A tuber is an edible root produced by a number of plants of various species. Tubers are grown worldwide and have been cultivated by humans for thousands of years. There are very many tubers that can be grown, so it is important to choose one that is right for your area. This guide will cover the kind of tubers we sell at Raintree Nursery.
Soak in water up to 30 minutes to re-hydrate, then plant in a pot or in the ground. Keeping horseradish in a container may help you control its spread, but don’t let the roots grow out of the drain holes into the ground.
Use a potting mix designed for vegetables, and keep evenly moist. In the ground, horseradish will appreciate the addition of finished compost mixed into the top foot of soil.
Wasabi grows best at 46-64°F. Grow under a shady leaf canopy unless summers tend to be cool and foggy. Above 70°F the plants may experience fungal disease or leaf burn, below 45°F they stop growing. Temperatures below 27°F may kill the plants.
Plant so the crown (the point where the leaves meet the roots) is about ½”above the soil. Amend the soil with finished compost 1 foot deep to provide plenty of humus and good drainage, then plant.
Keep plants cool on warm days with mist, but do not over-saturate the roots. In cold winter locations grow wasabi in pots using a well-drained vegetable garden mix, a 2-3 gallon pot should produce a nice sized root.
Yacon is hardy to 10°F, or colder if the dormant roots do not freeze in winter. Tops will die down with the first frost. Plant when all danger of frost has passed, in a rich well-drained soil, pH 6.5-7.2.
Plant in a mound amended with compost if your soil is heavy. Mulch the Yacon with compost to encourage strong growth and conserve moisture, keep soil evenly moist when actively growing. Tubers require about 200 frost free days to mature, and will be sweeter following frost. Plants can be started in a container in short-season locations, then planted outdoors when risk of frost has passed.
Use a garden type potting mix in a 1-2 gal pot, keep in a bright light situation, 50°F minimum temperature, and water regularly if the plant is growing.
Hardy to 0°F, Oca needs a pH range from 6.0-7.2, and well-drained soil.
Yields will improve with the addition of compost. Keep the soil evenly moist during the growing season, hill once or twice like you would a potato plant. Tubers begin to form as day length decreases, protect from frost in the fall to increase potential tuber size.
Start tubers in a container, use a well-drained mix for vegetables, and plant out after danger of frost. Or plant them directly in well-drained garden soil. Store the harvested roots at room temperature for several days after harvest to harden the skins and reduce the amount of oxalis, then store cool and dry.
Although it can be grown in many parts of North America, the Pacific Northwest is especially well suited to mashua cultivation.
The tubers should be planted in a sunny location during spring after all risk of frost has passed. Start mashua indoors in pots to get a head start on the season. They are tolerant of most types of soil, so long as they are moist, with a pH range of 5.3-7.5. Support or plenty of space will be needed for the vigorous trailing vines. Hilling after first emergence and at first flower may increase harvest. The tubers are ready for harvest in 6-8 months, or following first frost. They form near the surface and are harvested like potatoes.
Store the tubers up to 6 months in a cool, well ventilated location that is protected from strong light. Tubers left behind in the ground will sprout the following spring.