If the soil feels dry, it's time to water. In the spring and fall and in cooler climates, it might be sufficient to water container plants every two to three days. In the summer and in warm climates, container plants usually require daily watering, unless they are succulents or other drought-tolerant xeriscape plants.
If your plants are outside in full sun and in a planter or pot you're likely going to need to water every day. In ground plants won't need it as much, especially if you mulch. Stick your finger in the soil and if it's dry up to your second knuckle or close to it then you probably need to water.
Over-watered plants are likely to get root diseases, primarily root rot. You probably won't know your plant has gotten root rot until you notice that it is wilted, but the soil is still wet. What exactly is root rot? There are several different fungi that cause root rot.
In times of extreme heat, 1-2 times each week may be necessary. Know your plants though! Some plants prefer almost zero water during summer (manzanita, Ceanothus, madrone and cistus) and others wilt even when they have ample water (hydrangea, rhododendron).
As a general rule for most plants, do the finger test. Stick your finger in the soil next to the plant. When you pull your finger out, if it's dripping, don't water. If the soil feels moist/damp don't water, but you'll need to soon. If the soil is almost dry/dry, you need to water.
Trees, shrubs, perennials and most of the “permanent landscape” are fine when gardeners go away for a week or two of summer vacation. Potted plants and hanging baskets are more of a concern. These can wilt after just a day or two without water, especially in a hot, sunny spot and especially when recently planted.
If a plant is overwatered, it will likely develop yellow or brown limp, droopy leaves as opposed to dry, crispy leaves (which are a sign of too little water). Wilting leaves combined with wet soil usually mean that root rot has set in and the roots can no longer absorb water.
There's an art to deep watering. Try this strategy for your garden. Water the plants with a gentle stream for about an hour. The water should slowly saturate the soil without creating puddles.
Morning watering is actually preferable to evening watering as the plant has time to dry before the sun goes down. At night, water tends to rest in the soil, around the roots, and on the foliage, which encourages rot, fungal growth, and insects.
Your plants should be watered everyday, especially during the summer. They should also be watered in the morning. Morning is the best time to water because it gives the plants' leaves all day to dry out. This prevents fungus spots, which come from water sitting on leaves.
“Spritzing your plants is not the correct way to water your plants. In fact, it doesn't water them at all,” she says. While spritzing can provide some moisture, unless the plant really thrives in humidity (ferns, orchids, or bromeliads, for example), Hovis says spritzing can do more harm than good.
The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration). If this isn't possible because major damage was done or little healthy root system exists then expect about 2 weeks until improvement can be seen.
Run your sink into a watering can, cup, or bucket, and let it sit for a good 24 hours. This will allow chemicals like chlorine and fluoride the time to evaporate from the water. We like to have a full watering can ready to go with still water so that if our soil seems dry, we can water our plant without waiting a day.
Provide Slow, Deep Watering
If you are unsure how long to water new plants, aim for 30-60 seconds for small plants – longer for larger plants while moving the hose to a few locations around the plant. Avoid watering when the soil feels moist. The earth must be allowed to dry out between watering.
When to Stop Watering Annuals and Perennials in Fall. Flowers also need a steady flow of moisture right up until the ground freezes in late autumn. Wind down the water as temperatures begin to drop below 40 degrees. Most summer annual plants will freeze and die with the first or second hard frost.
In the summer and in warm climates, container plants usually require daily watering, unless they are succulents or other drought-tolerant xeriscape plants. Water deeply and slowly until water runs out of the drainage holes. Plants in hanging baskets are another step up in terms of watering needs.
Turn your hose on a slow trickle and place it 4-6” from the base of the plant. Let the hose run between 10-30 minutes, depending on the size of the root ball. Deep soaking is the best way to water your new plants. Deep soaking of a plant in its first year can be broken down into 5 phases.
Most plants need about 1 inch of water per week. So if you haven't received an inch of rain, then you'll need to give your plants a drink. Even if you have received rain, it's still a good idea to check the moisture level in your soil to see if your garden needs additional water.
The ideal watering schedule is once or twice per week, for about 25 to 30 minutes each time. Taking care of a lawn doesn't have to be an overwhelming, all-consuming task. Once all the tips and tricks are in your back pocket, it will be easy to come up with a routine that results in a gorgeous green lawn.
In hot weather you need to water in the mornings when it is cooler. This will allow more water to reach the root system before it evaporates in the heat. There may be times when you cannot schedule watering in the morning. In this case, water the plants in the late evening before bed.
Always watering at only one root point leads to one-sided root growth and thereby to poorer nutrient absorption in the soil. Therefore, always water around the plant and distribute in the entire irrigation area.
When a plant is first becoming overwatered, leaves turn yellow. If soil doesn't have a chance to dry out before you water again, leaves start to wilt. When overwatering is the problem, wilted leaves are soft and limp. (If too little water is the issue, wilted leaves are dry and crispy.)
Watering in the evening with a sprinkler or garden hose can lead to greater disease problems as the plant foliage will likely remain wet throughout the night. Mornings and evenings are excellent times to water gardens when using a drip irrigation system or soaker hose.
How to check for root rot. The main signs to look out for are: yellowing, wilting leaves, wet soil that isn't drying, black, wet roots, quickly declining health, and stunted growth.