Trees, shrubs and other vegetation are the lungs of the planet, so the more the better, especially in urban and suburban settings. Some of our ancient historical trees like the banyan at Kona’s King Kamehameha Beach Hotel get so big we tend to over prune them to keep them in scale. This amazing tree is the first thing visitors see as they enter by ship at Kailua Bay so it is important that the tree is properly maintained. The spectacular banyans that frame Banyan Drive in Hilo are another example of unique trees needing love and attention. The East Hawaii Outdoor Circle has been instrumental in protecting them.
Certified arborists or companies that specialize in tree care can do the job without negatively affecting the health of our trees. The loss of these truly amazing members of the fig family would be tragic. Imagine the destruction of the Malayan Banyans on Banyan Drive. The Great Banyan on the grounds of Kona’s Hulihe‘e Palace is another that is now protected but a few decades ago, there was concern it might be cut down. The Morton Bay Fig at Banyan’s surfing spot was not so lucky. Someone possibly poisoned the tree. The excuse used was that it was blocking the view. Fortunately the Hawaiian Community demanded that the tree be replaced although it will take many years to achieve the proportions of the original tree. Seedlings of the original tree were planted at Kona Cloud Forest Sanctuary in Kaloko Mauka and because of the ideal environment, they are now almost 100 feet tall in just 35 years.
This is a good time to prune. The sun’s intensity is still low so the newly exposed branches are not likely to sunburn as they would in summer. By proper pruning, we increase light availability to understory plants. Since some light is essential to plant vigor, it is a good idea to open up these heavily canopied trees.
Even when we are careful to select the right trees for the landscape, and shade lovers for underneath, there comes a time when we must consider pruning.
Whatever the natural form is in the beginning, it should be maintained, and this means individual handling of each problem. Trees should be pruned in such a manner as to remove enough of the canopy so as to allow gale force winds through the tree. Most tree experts agree that heavily topped or hat racked trees will be more susceptible to disease and insect attacks, so this practice is not recommended.
Pruning should be done for a purpose, such as to maintain the natural shape, remove diseased or awkward branches, or to reduce the size of a vigorous grower.
Pruning becomes an important chore for several reasons. Trees that respond to day length and bloom during the winter or spring months should be pruned through the summer months.
Many of our tropical trees grow rampant with extensive root systems. That is why we prune to keep them from getting out of hand, but let’s not forget the roots may need some pruning too. This is best done after hurricane season.
The trouble with roots of many big trees such as banyans is that they are greedy. Fortunately, there are many landscape plants like Monstera, Pothos, Philodendron species, Bromeliad species and ground covers like Ruellia that will tolerate these conditions.
Pruning trees and their roots can be dangerous, so if the job is major, it is better to call in a qualified arborist to do the job. This will also aid you in avoiding a butcher job that will cost a lot more in the long run.
When it comes to fertilization, it is better to keep it on the light side until early spring. Then an application of a complete fertilizer containing nitrogen, phosphorus and potassium plus trace elements will carry trees until spring.
Trees are part of the beauty of our islands. They supply oxygen and sequester carbon. They also cool the environment as our weather is getting warmer and warmer. Rather than destroying these valuable assets, work with them. Proper selection of plants to grow under their protective canopy is important. Proper pruning, fertilization and irrigation is a must, but it is much better than paving over Paradise.
For more information on tree care, contact the UH Master Gardener Helpline at 322-4893 in Kona or 981-5199 in Hilo.
