Managing Your Backyard Treescape

Daintree Rainforest, Cape Tribulation, northern Queensland, Australia

When you look into a forest, like the rainforest in northern Queensland Australia, it can be hard to see the individual trees from the forest. 

In man-made woodlands around our homes and workplaces, we get used to a specific look–big tree with smaller shrubs and ground covers. But a wild forest is forever changing and there is a progression of plants: small trees growing up under still standing larger trees. Too often we forget that trees have a lifespan or can be compromised by drought, disease, or poor management.

In our neighborhood we have seen these three variables reduce the large trees dramatically over 20 years. Our once tree-lined streets, now are sunny and mostly treeless.

During a botany walk a few years ago with representatives from some of the major botanical gardens in Southern California, I learned a valuable lesson–think like a forest and plan for succession of large trees. Several of these destination gardens had learned the hard way that wind storms and unexpected disease can wipe out your man-made forest in short order and regrowing those valuable trees takes time.

I know I have two trees that are past their prime. Our flowering plum tree (Prunus cerasifera) can put on a beautiful display in spring, but it is not a long-lived species and termites are now compromising this tree. She probably has a few more years, but it is time to think about succession. What will take this tree's place? Five years ago I planted a native redbud (Cercis occidentalis), just down hill of the plum tree. Finally, it is really taking hold and starting to grow. It too will offer flowers in the spring, but it will also offer food to native birds and insects. And three years ago I discovered a native coast oak (Quercus agrifolia) coming up as a volunteer. I'm grooming these two trees to take the place of the flowering plum.

Last year the arborists discovered a hollow in the Chinese elm (Ulmus parvifolia) that threatens to weaken the tree over the next few years. It will be a loss to our backyard shade when it goes, but we are planning ahead. We planted a native California sycamore (Platanus racemosa) just uphill to eventually take the elm's place.

Succession is natural in wild landscapes and with a little thought, you can make it natural in your landscape as well.

green ant from Australian rainforest

Intrigued by the Australian rainforest. 

Take a 1 minute escape to this far away landscape at TheEarthMinute.com

Yellow is the Color of Spring

Spring has definitely come to Southern California. A little bit of rain and the sticky monkeyflower has bloomed. This native monkeyflower hybrid with light yellow-orange flowers was a fall purchase from the Santa Barbara Botanical Garden.

Warm days are bringing out the creatures that hibernate–desert tortoises and western fence lizard. The longer warmer days have also enticed a male valley carpenter bee (Xylocopa varipuncta) out of the wooden tunnel where he hatched and grew as a grub. He is all golden and pristine on his first day out in the world.

His mother burrowed a tunnel into the trunk of our bottlebush. Then she laid eggs in the tunnel (each with a supply of food) and  sealed up the tunnel. The young male had to burrow his way out of his nursery.

It is easy to tell males and females apart, because the females are black and the males are golden. 

Spring promises more discoveries.

 

What Is Drilling Holes in Tree Trunk?

Can you guess what creature is drilling holes in this tree trunk? 

Each hole is a half inch in diameter.

See the answer.