The important task of supplying needed water to your landscape plants and trees becomes very critical in the hot summer months we are experiencing. With the craze in installing 'drought friendly' and 'water conserving' plants and trees, some people forget that even though those plants and trees that are quote 'Water Friendly' some of those plants and trees do need a application or a drink of water from time to time to maintain their health and sustain their lives out in this extremely heated months of the year.
By first grouping the plant and trees in proper design configurations within your landscape you will be able to benefit from using the correct plant for the correct zone. Sun loving plants just do not do well in north facing project areas and vice versa for shade plants in a overly sunny spot around your home or business. There are many other resources that will help assist you in selecting the correct plant or tree for the various zones in and around your home or business and let me suggest you check out the Tree of Life website at www.californativeplantys.com for those of you who live here in California. For those in other parts of the country, please link to your local county extensions and water supplier websites and I am sure they will be able to assist you.
Watering Times: It is best early in the mornings when the soil is cooler and it can naturally dry out doing the day as to prevent possible fungus damage from damp, dark evening time watering which is prime breeding ground for water borne diseases. In the desert zones you can get away with more of your evening into night watering because of the lower humidity rates but by watering in the early morning hours you are safe with not possibly getting fungus challenges.
How Much : A good rule of thumb is at to at least 1" of water per week. Deep soakings of the water help develop strong deep rooting systems for your plants and trees. By using a soil probe which you can obtain from a quality nursery or online or by simply sticking a pencil or screwdriver into the soil you can see at what depth the water you apply reaches. This simple monitoring system is really effective as some folks think that if it is dry on top of the soil, it must mean my plants need water. Not always true. Some soils hold more water in the ground than others because of the clay content of the soil vs sand content. Clay soils hold more water longer than sandy type soils. By using a soil probe, screwdriver or pencil to see at what depth you have moisture before and after a watering this can help you determine your watering application rate. Another great thing to do is have your soil tested to actually understand what type of soil you have. There is a simple soil texture test you can do yourself by going online and typing in 'soil texture test ' and you will come across a simple ribbon test to help you determine your soil type.
How often: Depending upon the soil type and what size plants you have, the first 1-3 months @ 1/gallon plant it is suggested you water 1-2 time per week. After 3-24 months 1-2 times per month ( some plants may still need more waterings ) After 24 months some plants will be naturalized and no supplemental water will be needed ( Most Calif. native plant groupings) and other plants will need supplemental waterings throughout their growing periods.
An occasional quick rinse or sprinkle in the early hours of the day is always a plus, and for your landscape trees deep water soakings of at least 1-2" 1-3 times per month of water is a great.
Drip irrigation is fantastic but ole fashion sprinkler system or micro-spray watering of your plant materials would be my choice for a more natural watering approach. I do not come across a lot of drip lines out in nature.
With these simple tips on plant selection, location, watering times and depths it is my hope that you will be able to not only establish your shrubs and trees be maintain their life spans for many years to come.