Posted on by tonytomeo · 20 Comments

Horridculture – Weed Whackers

P00708
This must be the better half.

This neatly sliced prickly pear is too silly to rant about. There is another just like it. Two others were not sliced, as if, after the first two, someone realized that there was more to the roadside meadow than combustible dry grass. The prickly pear were put out there just last winter. They each extended only a single pad half a foot or so above grade, so were obscured by the grass.

Realistically, the damage is minimal and tolerable here. The priority of the crew who performed the vegetation management was to cut down all the combustibles. They did an efficient job of it. They did not expect to encounter anything that had been intentionally installed out there, or even any desirable vegetation. Besides, this prickly pear will recover as if nothing happened.

Unfortunately, damage caused by weed whackers is rarely so innocuous. Weed whackers are one of the most commonly misused horticultural power tools, and are very often used by those who are not aware of how to use them properly. They are easy enough to operate that minimal consideration is given to the potential for damage that they can cause. It is a bad combination.

Because weed whackers are often and improperly used to cut tall grass that is too close to trees for lawn mowers to cut, they commonly strip off bark and cambium from young tree trunks. A tree can not survive without its cambium, and quickly dies if too much is stripped away from the base of its trunk. That is why it is very important to pull weeds from around trees instead.

For now, there is nothing to do for the two sliced prickly pear. The bud to the upper right corner of the pictured specimen is beginning to develop into a new pad.

Posted on by tonytomeo · 13 Comments

Every Dogwood Has His Day

P90928KDog days of summer are no time for a dogwood to bloom. It should be slowing down and getting ready for autumn. Plump floral buds start to develop, but then wait dormant as foliage turns color and falls away. Only after winter dormancy, just prior to the emergence of new foliage, floral buds bloom spectacularly. September is either half a year too early or half a year too late.

So, what is this dog and pony show?! ‘Eddie’s White Wonder’ dogwood is blooming not only in our landscape, but in other regions too. It is not just because our six new trees were distressed from installation earlier this year. That process would not have affected other trees. It was not because of our locally variable weather. It affected too many trees in too many other regions.

I certainly do not mean to dog our trees for their eagerness to bloom; but it is best to let sleeping dogs lie. They need their rest. Floral buds that bloom or try to bloom now will not be there to bloom when they should next spring. Only a few floppy blooms are seen on our trees, but closer inspection reveals that every bud is open, exposing the tiny individual flower buds within.

It does not need to rain cats and dogs for the floral buds to be ruined. Now that weather is cooling instead of warming as it would in spring, the floral buds that are now opening will not waste resources to finish blooming. The priority is slowing down for winter dormancy. Whether finished with bloom or not, opened floral buds will be shed along with foliage as autumn progresses.

Rhody might seem like he should obviously be an expert in regard to dogwoods, but he merely commented that “Bark is ruff!”P90928K+

Posted on by tonytomeo · 4 Comments

Plant Problems Are Sometimes Exaggerated

04It is not easy for wild trees to adapt to a refined landscape. After a lifetime of adapting to their native environment and dispersing their roots to where the moisture is through the dry summers, they must adapt to all sorts of modifications such as excavation, irrigation and soil amendment. Newly installed plants grow into a new landscape while some mature trees succumb to disease and rot.

Oak root rot is such a common disease in California that there are only a few places where it is not found in the soil. It is not often a problem to new plants, but often becomes a problem to mature trees that suddenly get more water than they are naturally adapted to, particularly if roots have been violated, and the soil has been amended to retain more moisture. Change is not always good.

However, many of the same trees that are so susceptible to oak root rot if the environment around them changes can be remarkable adaptable as young trees. California sycamore happens to be a riparian tree that naturally grows near water. Although old trees may not adapt well to change, young trees planted in new landscapes will adapt to the water that is available as they mature.

California sycamore trees that are adapted to landscape or lawn irrigation are not likely to be bothered by oak root rot until they get old. Realistically though, any old sycamore is susceptible to oak root rot. The only difference is that those that get more water mature faster, so get old sooner. A California sycamore tree planted into a home garden may live only one century instead of two.

Verticillium wilt is another disease that can be found in most places throughout California. It is notorious for severely disfiguring and killing ash trees and many other plants. However, it needs moist soil in which to proliferate. Because lawns are irrigated so frequently and often excessively, ash trees in lawns are innately susceptible to verticillium wilt. In situations that are not irrigated so frequently, newly planted ash trees can mature into healthy shade trees.