WATER: YOUR GARDEN MUST GET ENOUGH

Some plants are composed of up to 95 percent
water. Water is vital for sprouting seeds; plants need
water for cell division, cell enlargement, and even
for holding themselves up. If the cells don't have
enough water in them, they collapse like a threeday-
old balloon, and the result is a wilted plant. Water
is essential, along with light and carbon dioxide, to
produce the sugars that provide the plant with energy
for growth. It also dissolves fertilizers and carries
nutrients to the different parts of the plant.
Where the water comes from
Ideally, water for plants comes from rain or other
precipitation and from underground sources. In
reality, you'll often have to do extra watering by
hand or through an irrigation system. (If you have too
much rain about all you can do is pray). How oftenyou should water depends on how often it rains, how
long your soil retains moisture, and how fast water
evaporates in your climate. Soil type is an important
factor. Clay soils hold water very well—sometimes
too well. Sandy soils are like a sieve, letting the water
run right through. Both kinds of soil can be
improved with the addition of organic matter. Organic
matter gives clay soils lightness and air and gives
sandy soils something to hold the water.
Other factors may also affect how often you need
to water your garden:
• More water evaporates when the temperature is
high than when it's low. Plants can rot if they get
too much water in cool weather.
• More water evaporates when the relative
humidity is low.
• Plants need more water when the days are bright.
• Wind and air movement will increase the loss of
water into the atmosphere.
• A smooth unmulched surface will not retain
water as well as one that's well cultivated.
• Water needs vary with the type and maturity of
the plant. Some vegetable seeds are tolerant of
low soil moisture and will sprout in relatively dry
soils. These include Brussels sprouts, cabbage,
cauliflower, collards, corn, kale, kohlrabi,
muskmelon, peppers, radishes, squash (winter
and summer), turnips, and watermelon. On the
other hand, beets, celery, and lettuce seeds need
very moist soil. Herbs generally do better with less
water. A large plant that has a lot of leaves and is
actively growing uses more water than a young
plant or one with small leaves.
• Sometimes water is not what a wilting plant
needs. When plants are growing fast, the leaves
sometimes get ahead of the roots' ability to provide
them with water. If the day is hot and the plants
wilt in the afternoon, don't worry about them; the
plants will regain their balance overnight. But if
the plants are drooping early in the morning, water
them right away.
• Mulches cool the roots and cut down on the
amount of water needed, increasing the time that
plants can go between watering. When the soil
dries out, plants slow their growth—or stop
growing altogether. Swift, steady growth is
important for the best-tasting fruits and
vegetables. Mulches keep the soil evenly moist.
There's a right and a wrong way to water
So much depends on climate and the ability of
different types of soil to hold moisture that it's difficult
to lay down specific directions for watering your
garden. Generally, however, vegetable plants need
about an inch of water a week. The best time to
water your garden is in the morning. If you water at
night when the day is cooling off, the water is likely
to stay on the foliage, increasing the danger of
disease. Some people believe that you can't water
in the morning because water spots on leaves will
cause leaf-burn when the sun gets hot; this isn't the
case.
However hard it is to judge your garden's exact
water needs, there are two hard-and-fast rules about
watering that you should follow. First, always soak
the soil thoroughly. A light sprinkling can often do
more harm than no water at all; it stimulates the
roots to come to the surface, and then they're killed by
exposure to the sun. Second, never water from
above. Overhead watering with a sprinkling can or a
hose is easy and seems to do a fine job. But in fact,
overhead watering wastes water, makes a mess, and
sometimes bounces the water away from the plant
so the roots do not get any at all. Furthermore, many
diseases are encouraged by wet leaves. So direct
water at the soil, but water gently so that the soil is not
washed away or the roots exposed.
Watering with a can. Carrying water in a can or a
bucket can be exhausting and extremely unsatisfying,
especially if the water slops over the top into your
shoes. Watering cans are easier to carry but harder to
fill than buckets. They are good to use for gently
moistening the soil after planting seeds and for
settling dust. If you unscrew the watering can's
sprinkler head and replace it with an old sock, it will be
easier to concentrate the water at the base of the
plant where it's needed. The sock will break the force
of the water so it won't disturb the soil around the
roots.
Watering with a hose. A well-placed faucet and
hose can save a lot of energy. If you have a large
garden, a Y-connector for the faucet makes it
possible to attach two hoses at one time. Hose strategy
includes having enough hose to reach all points in
the garden and arranging the hose in such a way that it
does not decapitate plants when you move it
around.
If you have a lot of watering to do, five-eighthsinch
hose will carry twice as much water as a half-inch
hose. Spreading the water about can be speeded up
by using basins to catch the water and by digging
furrows or trenches between the plants. A length of
gutter with capped ends, placed on the higher side of
the garden, can be punctured at intervals to
coincide with the trenches. Then when water is slowly
added to the gutter it flows down all the trenches at
the same time. If you want to change the placement of
the holes, the ones you don't need can either besoldered up or filled with a metal screw.
Watering with a sprinkler. Lawn sprinklers are
gentle, but they waste water by covering the whole
area indiscriminately and spraying water into the air
where it evaporates and blows about. They also wet
the leaves, which can spread disease, and often
turn the whole area into a mudhole. Canvas soilsoakers
are preferable. They carry water gently to
the soil around the roots. A wand and water-breaker,
which is a length of rigid pipe that attaches to the
end of the hose, can make it much easier to put the
water where you want it. This is especially useful
when you're watering hanging baskets and patio
containers. A water timer that measures the flow of
water and shuts off automatically when the right
amount has been delivered is an expensive luxury.But it's an excellent device for the forgetful and can
free you to do other things while the garden is being
watered.
Gardening is a most satisfying occupation,
because you are constantly rewarded for your efforts.
All the work you put into your vegetable garden—
cultivating, mulching, watering, watching, and
waiting—shows dividends in the shape of healthy
plants that flourish visibly under your care as the
season progresses. And all the labor pays off in
tangible form at harvest time.
But even when you've weathered the whole
gardening season and brought your harvest home,
you still have a few more tasks to complete in order
to put your garden to bed for the winter.