6. Good Organic Gardening - November-December 2016 AvxHome.in

6. Good Organic Gardening - November-December 2016 AvxHome.in 6. Good Organic Gardening - November-December 2016 AvxHome.in

23.10.2016 Views

WEEKEND GARDENING | Summer shade THE HEAT IS ON! ... YOUR VEGIES The heat of the summer sun can be a real challenge in the garden, particularly the edible garden Words Claire Bickle Depending on your climatic zone, in the summer months, you may experience long periods of drought accompanied by scorching temperatures, or you could see heavy rainfall with high temperatures and humidity. Both high humidity and strong, radiant heat from the sun can damage plants and make them vulnerable, especially those you may be trying to establish. Most softer-leafed edibles will be grateful for some protection from the midday sun’s rays. In my experience, even summer-loving crops such as pumpkins, cucumbers and melons can have their leaves scorched beyond recovery. However, most of the edibles we like to grow do need a sunny location for healthy growth and to come to fruition. If you think planting your crops in a shady spot will resolve all the summer heat problems, you’ll soon find that’s not the case. They will stretch for the sun, be prone to fungal problems and insect attack and, because of the ambient air temperature, still bolt to flower. Common problems caused by too much heat Bolting: This is where plants prematurely send up flower spikes, flower and then set seed. High temperatures have this effect on many edible favourites such as lettuce, Asian greens, coriander, fennel, dill and more. A lot of edibles can also become quite bitter when deprived of adequate water during dry periods. Scorching and bleaching: This is where the tissue of the plant is damaged, which can then lead to fungal and bacterial problems and, of course, if hot enough, scorch a plant to the point of no return. Failure to form fruit: Sometimes the flowers of tomatoes, for example, may drop from heat stress, or fruit development can suffer. Plus, extreme heat favours development of more male flowers on some plants, such as pumpkin. GettyImages 54 | Good Organic Gardening

Summer shade | WEEKEND GARDENING Shade options Shade cloth: This can be used in the creation of a semi-circular shade tunnel, propped up and hung over on garden stakes or simply carefully placed on top of the crops if sudden extreme weather temperatures are forecast. You may wish to experiment a bit with which shade percentage in the various shade cloths suits your location, but I recommend keeping it to light shade. I personally think 30–50 per cent shading is better than 70 per cent. Other plants as nurse plants: There are many plants that can act as a windbreak or sun filter in the garden. Knowing exactly where north is on your property and the tracking of the sun during the day means you can strategically plant certain taller-growing, tougher edibles or ornamentals to cast shadow and shade onto softer, more delicate edibles. Some options include rows of sunflowers, fast-growing pigeon pea shrubs (Cajanus cajan), beans such as snake beans growing up a tepee, and trellises with plants such as passionfruit or chokos growing on them. Even underplanting larger vegetables, such as eggplants or corn, with lettuce, rocket or squash can be effective. You may need to experiment — gardening is very much about trial and error and finding out what works for you in your climate and location. Most softer-leafed edibles will be grateful for some protection from the midday sun’s rays. Protection from hot sun is essential for some plants Jana Holmer Water stress: A sudden need for water during heatwave conditions with heavy loss of moisture through evaporation can lead to blossom end rot, especially on tomatoes and capsicums. This blackening at the bottom of the fruit is due to calcium deficiency when the plant lacks water. Higher susceptibility to pest and disease: Heat- and water-stressed plants are weakened and more prone to disease issues and attack by pests. As you can see, inadequate protection from intense rays, especially coupled with poor nutrition and thirst, will diminish and even hinder crop productivity, making all your efforts before this point virtually wasted. A semi-permanent shade structure Good Organic Gardening | 55

Summer shade | WEEKEND GARDENING<br />

Shade options<br />

Shade cloth: This can be used <strong>in</strong> the creation<br />

of a semi-circular shade tunnel, propped up<br />

and hung over on garden stakes or simply<br />

carefully placed on top of the crops if sudden<br />

extreme weather temperatures are forecast.<br />

You may wish to experiment a bit with which<br />

shade percentage <strong>in</strong> the various shade cloths<br />

suits your location, but I recommend keep<strong>in</strong>g<br />

it to light shade. I personally th<strong>in</strong>k 30–50 per<br />

cent shad<strong>in</strong>g is better than 70 per cent.<br />

Other plants as nurse plants: There are many<br />

plants that can act as a w<strong>in</strong>dbreak or sun filter<br />

<strong>in</strong> the garden. Know<strong>in</strong>g exactly where north is<br />

on your property and the track<strong>in</strong>g of the sun<br />

dur<strong>in</strong>g the day means you can strategically<br />

plant certa<strong>in</strong> taller-grow<strong>in</strong>g, tougher edibles or<br />

ornamentals to cast shadow and shade onto<br />

softer, more delicate edibles. Some options<br />

<strong>in</strong>clude rows of sunflowers, fast-grow<strong>in</strong>g<br />

pigeon pea shrubs (Cajanus cajan), beans<br />

such as snake beans grow<strong>in</strong>g up a tepee, and<br />

trellises with plants such as passionfruit or<br />

chokos grow<strong>in</strong>g on them.<br />

Even underplant<strong>in</strong>g larger vegetables, such<br />

as eggplants or corn, with lettuce, rocket or<br />

squash can be effective. You may need to<br />

experiment — garden<strong>in</strong>g is very much about<br />

trial and error and f<strong>in</strong>d<strong>in</strong>g out what works for<br />

you <strong>in</strong> your climate and location.<br />

Most softer-leafed edibles will be grateful for<br />

some protection from the midday sun’s rays.<br />

Protection from hot sun is<br />

essential for some plants<br />

Jana Holmer<br />

Water stress: A sudden need for water<br />

dur<strong>in</strong>g heatwave conditions with heavy<br />

loss of moisture through evaporation can<br />

lead to blossom end rot, especially on<br />

tomatoes and capsicums. This blacken<strong>in</strong>g<br />

at the bottom of the fruit is due to calcium<br />

deficiency when the plant lacks water.<br />

Higher susceptibility to pest and<br />

disease: Heat- and water-stressed plants<br />

are weakened and more prone to disease<br />

issues and attack by pests.<br />

As you can see, <strong>in</strong>adequate protection<br />

from <strong>in</strong>tense rays, especially coupled with<br />

poor nutrition and thirst, will dim<strong>in</strong>ish and<br />

even h<strong>in</strong>der crop productivity, mak<strong>in</strong>g all your<br />

efforts before this po<strong>in</strong>t virtually wasted.<br />

A semi-permanent<br />

shade structure<br />

<strong>Good</strong> <strong>Organic</strong> <strong>Garden<strong>in</strong>g</strong> | 55

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