Xtremehorticulture

Differences Between Xeric and Mesic Plants

             Many homeowners don’t know the names of plants in their yards or landscapes. Most can look at a plant and know if it is a tree, shrub, or flower but not its name much less how often it should be watered and with how much. This pyracantha was known as a “plant with berries” to a homeowner trying to calculate its landscape water use. Pyracantha does have berries but it is considered “mesic” in its need for water. Xeric plants vs Mesic plants Lower water use trees, shrubs and flowers are watered less often. They should get the same amount of water when they are irrigated but don’t need it as often. That’s how xeric, or lower water use, plants operate.             One way to find out if an unnamed plant is xeric is to water it less often during the cooler months. In the long run xeric plants are watered less often. That’s how they, and you, save water in landscapes. If it starts looking bad to your eyes or dies, then it is most likely not xeric. Big Trees are Seldom Xeric             Another method is their size. Big trees are seldom xeric. Xeric plants are not big. They tend to be smaller. The bigger xeric trees and shrubs grow where water collects; arroyos, waterways, and desert springs. This young shoestring acacia is a 40 foot tall mesic tree from Australia that grows along waterways. This shoestring acacia was “topped” (not done that well I might add) probably because it was getting too tall for that spot. Shortening its height will reduce its water use but not how often it needs water. Big trees use more water than smaller trees. This is true even if you buy one that is small and it grows big when it gets older. Just like kids. You don’t know if your child will become tall or not until they get closer to that size. Oh wow…which side of the family did HE/SHE come from? How to Reduce Water Applied to Your Landscape             During these cooler fall months, start watering less often and see what plants start looking not so good. Try adding more drip emitters to those plants looking not as good as you are watering less often. This gives these plants more water but still less often.

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Glad You Selected a California Pepper Tree

Q. I have a California pepper tree near my pool that’s constantly dropping leaves into it. I am wondering if I can lower its height so it will drop fewer leaves and stems. Anything else I should think about? Because pepper tress are usually evergreen during warm winters in southern Nevada they will drop their leaves all season long. A. California pepper tree is a better selection than Brazilian pepper. But they are both evergreen and can pose a problem near water that you want to keep clean. Evergreen plants constantly drop leaves all season long but drop their leaves heaviest soon after times of new growth. A deciduous tree that drops its leaves for the winter months is a better choice near pools because you clean the pool only once. Read more about pepper trees here Make Sure its Not Water Make sure it’s not dropping leaves because of a lack of water. Increase the amount of water and the frequency of application to make sure it’s not dropping its leaves because the soil is too dry. The recommended frequency of water application by water purveyors is correct for mesic trees growing in landscapes. Check to make sure enough water is applied each time to penetrate the soil 18 to 24 inches deep. Make sure that water is applied to at least half the area under the tree canopy. Water again when the soil at 8 to 10 inches deep is about half full of water or starting to dry out. To reduce soil evaporation and we growth, apply a surface mulch of rock or woodchips to a depth of 2 to 3 inches.             Also remember to apply water on, or just before, windy days. Use your weather app on your phone to judge when it will be windy in the future. You’re Right             You’re right in that lowering the trees height decreases the amount of leaves and stems you must clean up, but evergreen trees are still going to drop leaves at inconvenient times of the year. If you decide to lower the trees height rather than replace the trees, then pay the extra expense to have it done correctly by a licensed arborist. Not all licensed arborists are good at pruning trees. See some examples of their work before you employ them.

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Please Dont Prune Your Palo Verde LIke This

I was dumbfounded. I saw it from the bus. I take the bus to the Orchard in North Las Vegas up Decatur when I go there to teach or just volunteer. I got off the bus and walked over to this tree because it was sooo obvious. What in the world was going through this person’s head? A beautiful tree and its form butchered. The tree could have been pruned with fewer cuts and not so much to clean up after you were done. This will take years to correct by a competent, skilled tree worker. Some say “arborist” but there are skilled arborists and unskilled arborists. There are skilled tree workers and unskilled tree workers. There are skilled gardeners and unskilled gardeners. Some of the best tree work I have seen was done by an indvidual (now passed) many years ago who had no training (at the time) but was sensitive to the look and needs of the tree. He went on to become an excellent arborist. (Steve Hines where are you?) Heading cuts. The cuts made at the very top are what I call “heading cuts”. They were made anywhere  along the length of a branch. When this is done we call this “topping” a tree. This is not a good idea for many reasons. From the looks of all that growth at the top, the tree has been topped at least one other previous year. Pruning in the spring invigorates the tree. One heading cut results in three to four new stems growing from buds immediately beneath the cut. One cut branch now = 3-4 new branches that need cutting next year. When topping is done the new growth is prolific. This prolific growth shades the interior canopy resulting in death of branches inside where there is too much shade. Thinning cuts. Cuts lower on major limbs on this tree were made with what I call “thinning cuts”. Thinning cuts are made at a juncture of two limbs leaving one limb remaining. This type of cut should be made 95% of the time when we prune. Thinning cuts leave another branch to take the place of the one just removed. This helps decrease the amount of new growth we get from pruning. This type of cut helps retain the natural form of the tree. Determine what you want the tree to do. What do we want from the tree? Is it to give shade? Will people walk under the tree? Does the tree need to be shrunken in size? What we expect from the tree dictates how we will prune the tree. Prune with a purpose in mind. The right approach to pruning a tree like this is to start at the bottom and work up. Make sure the major limbs are necessary. If there are too many, you might consider removing a major limb at the very beginning. This is true particularly if there are just too many larger limbs, if they are crossing, broken or damaged. If the tree needs to be shorter then identify the limbs that need to be lowered and follow them down inside the canopy to a place where you can make a “thinning cut”. Lower the tree’s height be identifying each of these limbs that are too tall and reduce their height with thinning cuts. If the tree is growing toward a building or structure then remove limbs growing in that direction or that will interfere. Make the cuts using what kind of cut? That’s right, a thinning cut, not a heading cut. If we need to allow people or vehicles to pass under the tree identify the offending branch or branches and remove a portion of that limb with what kind of cut? That’s right. A thinning cut. So when do we make a heading cut? Not very often but when we do it is usually for three reasons: increase the density (more new growth; 1 cut=3 to 4 new branches) where the canopy is not dense enough, to add dimensional strength to a limb that is thin and spindly, to increase side branching to increase fruiting or flowering on trees that produce flowers/fruit on spurs. A correctly pruned landscape tree should not appear to be pruned when it is completed and done right.

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