59°F
weather icon Clear

Pine needles benefit alkaline soil

Question: We have nine pine trees, and they are dropping lots of needles. We have a large berm under the trees and water inside the berm twice weekly. Should the needles be removed or left inside the berm?

The needles are fine. If composted, they are said to be slightly acidic and will benefit our alkaline soils. If they are left alone in the basin, they will help mulch the soil, conserve water, reduce weed emergence and benefit the soil in general.

A lot of needles blew out of the trees during the last storm event we had. This is a normal occurrence and nothing to worry about.

If pine trees are getting plenty of water and fertilized once a year, they will have a thick, lush canopy and grow about 12 to 18 inches a year. If water is not enough, they will not grow as much and not have a dense canopy. They will survive like that but just not be as thick and lush.

Your berms should extend three to four feet from the trunk and be deep and level enough to hold about 3 to 4 inches of water. Your watering frequency sounds right. Just make sure it gets enough water each time to move into the soil two to three feet or more. In sandy soils, water needs to go deeper and more often.

Bob Morris is a professor emeritus in horticulture with the University of Nevada and can be reached at extremehort@aol.com. Visit his blog at
xtremehorticulture.blogspot.com.

Don't miss the big stories. Like us on Facebook.
THE LATEST
Watch out for hornworms lurking in your garden

Anyone who has been gardening for a while has a horror story or two about hornworms, which infest many vegetables in the tomato family.

What can be done about high boron levels in soil?

Boron is one of the salts commonly found in desert soils. It can be present naturally or it can accumulate over the years in such places as horse corrals.

Do honeybees prefer pink flowers over white ones?

All of the so-called temperate fruit trees flower in the spring. The white-flowered types such as almonds, plums and pluots, apples and pears usually flower a bit later.

Is redbud tree a good choice for pool area?

My landscaper is recommending a redbud tree in the planter attached to my pool. I asked him if that’s a good tree to plant so close to the pool.

Can scent tell me what kind of plant this is?

You should smell a big difference between bay laurel and cherry laurel, which come from different plant families despite their similar names.