Ole! Ole! Oleander!

June 2, 2010 | By | Comments (56)

Red oleander

“Oh, that won’t grow here.” How many times have aspiring gardeners had their hopes dashed by such a blanket statement? The fact is just because you don’t see something growing in your neighborhood doesn’t mean it won’t. Oleander (Nerium oleander) is a good example.

Native to the Mediterranean region, this shrub has so much going for it. It’s evergreen. It’s easy. It’s tough. It offers weeks of beautiful single or double flowers in a huge range of colors, including red, pink, peach, yellow, and white. The only thing that holds it back is tenderness to cold.

Peach oleander

Because many people see oleander growing at the beach, they think it won’t take frost. They are wrong. More than 25 years ago, I bought a small pink oleander at a garden center on Pawley’s Island, South Carolina while on a family vacation. I took it home to Maryland. When I moved to Alabama, that oleander came with me. It’s blooming this very day (see photo below). And I’ve learned how much cold oleanders can really take.

 

Oleander 003

Twenty degrees. That’s how cold it can get without causing any damage to flower buds or foliage. At 10 degrees, flower buds die and leaves get burned. At 0 degrees, the plant will probably die to the ground and then regrow. Because mine grows in a big pot, I take it inside the garage when night temps drop into the teens. But especially hardy selections, such as ‘Hardy Pink’ and ‘Hardy Red,’ do bend the barriers. I’ve seen an established, 10-foot tall, pink oleander in full bloom growing in front of a house in Moundville, Alabama. I know it’s been there for years.

Growing conditions. Other than winter cold, almost nothing bothers oleander. Just about any well-drained soil will do — acid or alkaline. Once established, it’s very drought-tolerant. It also withstands wind and salt spray, which is why it’s a favorite for beach planting. It needs little fertilizer. Give it full sun. Very few pests assault it, except for oleander caterpillars (see below).

 

Oleander caterpillars

Pests. Moths lay eggs on the undersides of the leaves. The eggs hatch into voracious bright orange caterpillars with tufts of black hairs. Severe infestations can defoliate a plant. To prevent this, spray your plant according to label directions with Bt  (Bacillus thuringiensis), a bacterium that is harmless to people, pets, and most insects, but lethal to caterpillars.

Pruning. Oleanders can grow 10-20 feet tall if you let them, so here are some basic pruning guidelines. Prune these shrubs immediately after their flowers fade. This will encourage new, fresh growth and you may get more flowers. Older oleanders may get woody and bare at the bottom. Rejuvenate them by cutting off 1/3 of the oldest trunks at ground level in spring over a three-year period. Don’t want to prune? Buy a dwarf selections, such as ‘Turner’s Carnival.’ It grows only about 4 feet tall.

Where to buy. You’ll often find oleanders for sale in local garden centers and nurseries. Top Tropicals is a good mail-order source.

Isn’t oleander poisonous? Why, yes, the sap is. Despite this, hardly anyone gets poisoned, because the leathery leaves and stems are thoroughly unappetizing, unless you’re an oleander caterpillar. The Grump did hear of Boy Scouts getting poisoned by toasting marshmallows over a campfire using oleander sticks for skewers. My expert advice? Don’t do this.

—-

Thanks to kellyv, mccheek, and cjewell for photos.

COMMENTS

  1. jan

    took a sample to the gardener today and he said it was witches broom, worst case he had ever seen…no cure except to chop it down! Re: the pot … looked like the pot farms they have on TV for the states that it is legal!!!!! Etc…..

    April 25, 2016 at 4:51 pm
  2. Grumpy Gardener

    Jan,

    Be patient! They’ll open soon. BTW, how do you know what marijuana flowers look like?

    April 25, 2016 at 2:43 pm
  3. Jan

    our oleander has lots of buds that look like the buds of marijuana plants! They are hard and do not want to bloom. any suggestions?

    April 13, 2016 at 2:05 pm
  4. Grumpy Gardener

    Josh,

    You could go ahead and shorten any flopping branches. They will firm up after time, however.

    March 9, 2016 at 3:47 pm
  5. Grumpy Gardener

    Jacqueline,

    Yes.

    March 9, 2016 at 3:44 pm
  6. Josh

    I live in Phoenix and have two rather large Oleanders (10-15ft). They have been flowering for a couple weeks. Now they are starting to flop over severely, especially the tallest, middle branches. Doesn’t appear to be the weight of the flowers, or new growth per se because even some of the shorter, non-flowering, lower branches are flopping. Does this imply that I need to prune them back?

    March 7, 2016 at 8:11 pm

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