Friday, May 27, 2011

Spinach

Is it too hot to grow spinach now? During the summer months, I usually grow Malabar, a heat-tolerant cousin to spinach, but this year I'm trying heat tolerant Japanese spinach varieties instead.

Komatsuna, sold by Evergreen Seeds
most closely resembles spinach in texture and shape. The flavor of Komatsuna is spicier than traditional spinach.

Okame, sold by Kitazawe Seed Company has spinach-like flavor, but has thicker, serrated leaves. Grow Okame in late spring and early fall. Though it bolts later than traditional spinach, it does bolt quicker than other Japanese spinach varieties.

Samba, sold by Kitazawa Seed Company, is fairly heat tolerant and is resistant to powdery mildew. A bit crunchier than traditional spinach, Samba must be cooked before eating.

In partial shade to full sun, plant the seeds or transplants 12-18 inches apart in rows at least 2 ft. apart. Spinach is a heavy nitrogen feeder and requires a consistent watering schedule. Excessive water encourages powdery mildew, however, so allow the top two inches of soil to dry before watering again. Drip irrigation discourages moisture related disease.

Sunday, May 8, 2011

Grapes

Ever wanted to grow grapes and make your own wine or jelly? It is not as difficult as you might think! You can even grow them in containers. Coming in at #12 on this year's "Dirty Dozen" list, imported grapes -- often all you can purchase at the grocery store -- might give you a little more motivation to try growing grapes.

I first tried growing grapes when I wrote Container Gardening for Health: The 12 Most Important Fruits & Vegetables for Your Organic Garden. I grew Muscadine grapes because they grow easily in north and central Florida. I don't like them for fresh eating, but they are an excellent source of Resveratrol and also make excellent jelly.  Resveratrol is the powerful antioxidant found in the skins of red grapes.


Here's a short excerpt from the book:

Michigan State Food Monitoring Program tested fresh grapes in 1991. Nine different pesticides were found on samples tested. Twenty-three percent had residues of Microbutamil and 23% had residues of Iprodione.

In 1994, the Texas Department of Agriculture conducted pesticide residue testing on grapes at wholesale outlets in Texas. Sixty-one percent of samples tested positive for more than one pesticide residue. Twenty-two pesticides were found in total...

"Muscadine grapes grow throughout the southeast, extending from central and northern Florida along the Gulf of Mexico to Texas and as far north as Missouri. Pest and disease resistant, these vines are almost always grown without chemicals. Though muscadine varieites have rather large seeds, they are prolific producers of sweet delicious fruit...

'Thompson' is suitable for desert climates. In colder climates, consider 'Reliance' or 'Canadice.'

Growing Grapes in Containers:

"Grapes have a tap root and need a very deep container. To have a chance at producing fruit, containers should be at least 15 inches deep.
Excellent drainage is especially important when growing grape vines. Add 1/4 inch of gravel to the bottom of a container with at least three drainage holes...

Site Selection

"As grapes are a vining plant, set up a trellis for them prior to planting. Grape vines are usually trained to travel horizontally so keep this in mind when selecting a location for the plants. Because the plants will quickly grow onto any support they can reach, it is not easy to move the plants to other locations during inclement weather. Select a site where the plants can grow year round. If a fence is not available, attach a trellis to a wall using supports spaced 4 to 6 inches from the wall to allow air circulation...





Optimum Growing Conditions:

Location/Sun Exposure:
Fruit production may be diminished in windy conditions. Select a protected site for growing grape vines. Muscadine varieties produce fruit in full sun to partial shade. Site selection for true grapes depends on the temperature. In hot climates, place grapes in full sun to partial shade. In cooler regions, true grapes require full sun.

Moisture: Water grape vines consistently, but allow the soil to dry between waterings. To avoid excess moisture on the leaves and subsequent fungal diseases, consider installing drip irrigation.

Temperature: Muscadine grape vines - 10 degrees Fahrenheit and warmer. True grapes - variety specific. (chart provided in the book.)

Soil: Grapes prefer well-draining soil in a pH range of 6.0-6.5 .

Fertilization: Grapes generally do not require a lot of fertilization. High levels of nitrogen will cause the plant to grow excessive foliage with little fruit production. A treatment with dilute organic balanced fertilizer is usually sufficient..."

There is much, much more about growing grapes in container in Container Gardening for Health, but I hope this blog gets you thinking about growing grapes.