MORE FOOD FROM FOOD

Watercress

Root stems from bagged salads in water, then grow in well-watered containers.

Root ginger

Look for greenish-yellow buds and half-bury in compost.

Sweet potatoes

Grow in sacks inside the greenhouse for best results.

Mangoes

Treat stones like avocado pits for an unusual tropical houseplant.

Jerusalem artichokes One tuber multiplies into a clump and lasts years.