Five most useful edibles for your Food Forest

Tired of mowing a boring lawn? Use your yard instead of being used by your yard - grow edible landscape! Below are several plants that made our life happier and meals healthier. Besides, these are fun to grow! Try them out:

1. Hibiscus sabdariffa - Flor de Jamaica, Karkade Sorrel - Flowers are used to make a tea "Agua de Flor de Jamaica". Medical studies show that it lowers blood pressure and has diuretic effects. The pleasant flavor is on the tart side similar to a cranberry juice. We make this cold tea every day - perfect for hot summer. Full sun.

2. Gynura procubens - Longevity Spinach, Cholesterol spinach - one of the Superfoods, and there are many claims that it lowers cholesterol. We use it in our cooking all the time and so far we are all alive! Full sun.
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3. Sauropus androgynus - Katuk, Tropical Asparagus. Delicious young shoots, one of the most popular leaf vegetables in Southeast Asia. In Vietnam, people cook it in stews and soups. It is among only a few flora containing vitamin K. Full sun or semi-shade.
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4. Cymbopogon citratus - Lemon grass: Versatile performer in the kitchen where it can be used in teas, beverages, herbal medicines, Eastern inspired soups and other dishes. Full sun or semi-shade.

5. Lippia dulcis - Aztec Sweet Herb, Sweetleaf: Mexican herb with incredibly sweet leaves that can be eaten from the plant like candy or tossed into fruit salads for an unusual addition. It has been used since the time of the Aztecs for coughs and colds. Tastes great, can be used by diabetic patients. We add this herb to Karkade or Mint tea as a sweetener. Shade or semi-shade.

Cold protection of tropical container plants

Q: I am long time customer of yours, I live in San Diego California and while the summer and Fall temperatures are warm to mild, the winter temperatures dip to a point where some tropicals die off. We are experimenting with different variations of way to heat and insulate the pots we have the tropicals planted in as a way to keep them alive during the colder winter months. I was wondering if you knew of the ideal soil temperature for these tropical in order to look their best year round. All of the heaters we have installed have thermostats and temperature adjustments so we can now keep the soil anywhere between a range of between 65-75 degrees. Any advise you can provide would be greatly appreciated.

A: This is a very interesting concept you are working with. Indeed, keeping pots/roots warm, may help a lot! We've been experimenting with cold protection for a long time - for the above-ground plant parts. For sure keeping roots protected (even with a thick layer of mulch) will benefit tropical plants during winter. In case with container plants, this may help dramatically.
The guideline is, tropical plants slow down or stop their metabolism at 65F. As long as you can keep soil above that temperature - this should work great. Of course, the higher the better.
Optimum temperature for growing tropical plants in general - 70-85F. Above 90F, metabolism stops too, unless it's a heat tolerant, desert plant.

Greenhouse in Virginia
Plumeria cold protection
Ghost Cold Protection
Seven rules of cold protection for tropicals
About Cold Protection
Cold protection - winter action for your plant collection
Tropical Treasures articles on zone pushing.

Q: Has anyone ever tried using heat packs under frost blankets to protect tropical plants from frost?

A: The reality is, the heat packs used for shipping do not have enough heat capacity to create efficient warming effect. From our own experience, the best way is to use small 25W incandescent bulbs which produce lots of heat (considering observing all safety precautions and fire safety). Some gardeners use Christmas lights. See picture of our plants in the ground during a cold night. We called them Ghost Cold Protection! ;)

See more columns on cold protection:
Seven rules of cold protection for tropicals
About Cold Protection
Cold protection - winter action for your plant collection
Tropical Treasures articles