Consider this a brief public service announcement for readers in the tragically narrow avocado growing zone by way of a short review of basic plant biology.

I see a lot of grow-an-avocado-from-a-pit tutorials on the interwebs. It’s a great project for both kids and adults. If you’d like an avocado houseplant, by all means grow one from a pit. If, however, you live somewhere where avocados grow outside (USDA zones 8 through 11) and intend to plant your seedling outside, you should buy a tree from a nursery. Why? Bees love to pollinate avocado flowers. If you plant an avocado seed you’ll get some weird cross between the many different avocado varieties. Odds are it won’t taste good and who wants to water a tree for nine years only to get a bushel of foul avocados?

So to review: if you’d like a houseplant go ahead and plant that pit. If you’d like to keep your hipsters supplied with avocado toast buy a tree from a nursery or learn the art of avocado seedling grafting.

Tree knowledge is not one of my stronger skills. Thankfully Cal Poly San Luis Obispo has us tree ignorant Californians covered with an extensive, searchable tree database called SelecTree that will help you find the right tree for your yard.

Or, let’s say, you’re bored with hours spent adding movies to your Netlix queue that you never plan to watch (one of my vices). How about searching for oddball trees instead? What about a California native tree with favorable fire resistance, low root damage potential that produces edible fruit? The database came up with two options, the hollyleaf cherry (Prunus ilicifolia) and the saguaro cactus (Carnegiea gigantea).

Let me also put in a plug for our favorite tree, the Fuerte avocado (Persea americana ‘Fuerte’).

Erik and I have been enjoying Dr. Jerry Turney’s Tree Identification classes at the Los Angeles Arborteum. Talk about high tree geekery! The last one was all about palms, and though I know that most of our readers probably don’t live in palm-friendly climates, I’m putting this out there for those of you who do, and for all you random Googlers.

My take away from the talk is that most of the horticulture problems involving palms rise from poor practice and bad information. If a palm gets enough water, doesn’t freeze, and doesn’t get hacked up by us in misguided attempts to prune them, they are stately, beautiful, easy care trees.

So these are 4 good ways to try to kill your tree:

1. Never Water It.  Palm trees grow in the desert, yes, but they are oasis plants. They grow by open water, or above underground water. They are tough, but tough is not the same as invincible, and they don’t show stress as clearly as other trees do, so you may not know that it is thirsty until it is too late. If it gets no water, one day your palm may just droop over, like a spent flower, and that is that. As the drought in Southern California continues, I’m beginning to worry about our iconic street palms. We tend to give them no thought whatsoever, but it may be time to start watering them if we want to keep them.
2. Over Prune. If you imagine a clock face overlaid on the crown of a palm, never cut above 9 and 3 o’clock. And never, ever, opt for the heinous and misguided extreme pruning called the pineapple or hurricane or candle style cut, which leaves just a few fronds poking out at the top. Pruning a palm this way will only stress the palm and stands a good chance of killing it. Here’s a quick photo reference.
3. Prune your palm with dirty tools. Diseases are carried on chainsaws and the like. Poor pruning hygiene has infected the stately 100 year old Canary Island Date palms in our local Elysian Park with deadly Fusarium wilt. Simple carelessness destroyed this beloved local landmark.
4. Climb the palm with spikes. Those spikes leave holes which do not heal. They become portals for various sorts of fungal infections. These infections can be as dangerous to you as the plant, because if the crown rots from the middle, you may not notice it is even sick until the entire crown just falls off and plummeting down, all two tons of it. Falling palm crowns smash cars and kill people.

All in all, most of the problems palms suffer come from us pruning them. The simple solution is to leave them alone. Don’t prune it if you don’t have to. Don’t be fetishistic about tidyiness. Let the palm be its natural self. It knows how to grow, it knows where it wants its fronds and boots– after all, palms are much, much, much older than us as a species. They know what they’re doing. You’ll save money and the palm will thank you if you leave it alone. If you do prune your palm, hire a company that knows what they’re doing, or research the topic well before doing it yourself.

One final fascinating fact: you can read the history of a palm in its trunk.  When it undergoes stress from extreme drought or bad pruning, the trunk contracts. If you see a trunk which has pinched areas, you know that something bad happened at that time.

Save