Garden beds dry out very quickly in windy weather, including those beds protected by mulch. The reason is that plants maintain some humidity around them by drawing water from the soil and releasing it through tiny holes in their leaves, a process known as transpiration. As strong wind constantly removes the moisture, more and more water is drawn from the soil in an effort to maintain humidity. As soil dries out, cells collapse in the soft tissues of plants causing drooping of plants and possibly death of small seedlings.
A way to avoid this problem in windy weather is to use plastic soft drink and juice bottles to funnel water directly to the root area of susceptible plants. This is a quick and very efficient way to hand water during water restrictions or windy weather. Limp tomato seedlings will freshen up in about 10 minutes after watering by this method.
Simply cut off the base of each container, remove the lids and bury the necks of the containers about 8 cm deep near outer edge of the foliage of plants. Large shrubs may require several containers. Pour water into the container until it begins to drain slowly – an indication that you have dampened the soil in the root area.
For plants that are generally sensitive to wind, filtering the wind rather than blocking it provides better protection for delicate plants. A solid cover or wall causes wind to whirl around on both sides of the screen, but a lattice trellis or product called ‘Windbreak’ on the side of the prevailing wind reduces the impact of the wind, as indicated below.
Heat waves place extreme stress on gardens when plants lose lots of water through their leaves in an attempt to keep cool and retain humidity around their foliage. You can help reduce moisture loss by providing some temporary shade over sensitive plants in the vege patch and ornamental parts of the garden.
See also: Sun and heat protection
However, seedlings and pot plants are usually the first to suffer in heat waves, and these may need watering twice a day until weather returns to normal. If potting mix dries out, the first sign may be complete collapse of a plant. If you water dry potting mix in the normal way with a hose or watering can, your plants may not be getting as much water as you think. This is because potting mix shrinks slightly when it dries, leaving a narrow gap between the mix and the pot. When you water, most of it runs into the gap and out through the drainage holes, leaving the mix around the roots still dry. Seedling punnets and smaller pots can be thoroughly watered by immersing the entire pot in a bucket half filled with water, or use a laundry tub if a lot of pots need reviving.
Water should come over the top of the pot. Leave the pot in the water until bubbles cease to rise. Short term immersion won’t hurt the plants. Then lift the pot allowing it to drain into the container. This method of watering also works very well when your water supply for plants is strictly limited.
For pots too large to be immersed in a container, fill some large soft drink or juice containers and insert 2 or 3 neck down into the potting mix. Provide support if necessary and allow them to empty slowly into the mix. Re-fill the bottles and repeat watering until water is being drawn into the mix very slowly. If heat is likely to continue for some time, place some mulch or stones on the surface of the potting mix to slow evaporation.