Water Flowers From Above
Most people water from above, using an oscillating sprinkler or a handheld hose or watering can of some sort. This has several disadvantages. In the first place it takes a considerable amount of time. Also when you water this way, you can lose as much as 30 to 40 percent of the water from evaporation and runoff. Overhead watering causes another more serious problems. It encourages disease. Fungi like moist conditions and may find the wet leaves of your plants very enticing. Of course, leaves do get wet when it rains, but if you can avoid wetting the leaves every time you water, you will definitely reduce the chances of disease infecting your garden plants.
Best Technique - If you do use overhead watering methods, use these techniques for best results. First, always water deeply so that the soil is moistened at least 1 foot down. If possible, water in the morning, so foliage has a chance to dry. This minimizes disease problems. And last, avoid watering at midday because too much water will be lost to evaporation.
Water Flowers Direct Into Soil
Consider using soaker hoses or a drip system, especially if you water frequently or live in an area where water is at a premium. They use much less water than traditional sprinklers. Water from a drip system has no chance to evaporate or run off because it is completely absorbed by the soil. These systems also help fight disease, since they prevent water and soil-borne fungi from splashing up on to the plants. With a soaker system, it is not only okay to water at mid-day; it is a desirable time during hot weather. Cooling the soil in July and August reduces the plant’s stress from the heat of the summer.