Overgrown, old Texas sage (Leucophyllum frutescens ‘Green Cloud’)

You have undoubtedly seen an old, overgrown shrub filled with mostly leafless branches that rarely flower anymore. Or, perhaps it is an aged succulent that has brown patches that are slowly encroaching onto the upper parts of the plant from the base. So, what is the solution for plants that no longer add decorative value to our landscape?

Old rosemary filled with unproductive woody growth

While some woody plants such as Texas sage or oleander can be rejuvenated by severely pruning them back, not all plants respond favorably to this and grow out again. Let’s take a look at some Southwestern favorite shrubs and succulents and talk about whether you should prune severely or when it’s best to replace.

Oleander that has undergone severe renewal pruning in spring.

Many shrubs can be rejuvenated by severely pruning them back, which gets rid of old, woody growth and stimulates the production of new branches, which will flower more (in the case of flowering shrubs). It is helpful to think of severe renewal pruning as the “fountain of youth” for many plants. This type of pruning is best done in spring, once the weather begins to warm up. Shrubs that respond well to this include bougainvillea, jojoba, lantana, oleander, Texas sage, and yellow bells. It’s important to note that not all shrubs will come back from this method, but the pruning didn’t kill the shrub – it only hastened the demise of the plant that was already in progress. If this happens, replace it with another.

Old desert spoon (Dasylirion wheeleri)

There are some plants that don’t respond well to renewal pruning or where that isn’t possible to do in the case of succulents. In this case, the solution is simple – take them out and replace them with a younger version of the same plant. Examples of plants that are better removed and replaced include aloe, desert spoon, red yucca (hesperaloe), rosemary, and prickly pear cactus. When you think about it, the cost isn’t very high, when you consider the beauty that these plants added to your landscape for eight years or more.

Heavenly Cloud Texas Sage several weeks after severe pruning.

When you think about it, the cost isn’t very high, when you consider the beauty that these plants added to your landscape for eight years or more.

*Have you severely pruned back an old shrub and had it come back beautifully? Or, maybe you recently removed and replaced some old succulents?

 

Noelle Johnson, aka, 'AZ Plant Lady' is a horticulturist, certified arborist, and landscape consultant who helps people learn how to create, grow, and maintain beautiful desert gardens that thrive in a hot, dry climate. She does this through her consulting services, her online class Desert Gardening 101, and her monthly membership club, Through the Garden Gate. As she likes to tell desert-dwellers, "Gardening in the desert isn't hard, but it is different."

2 replies
  1. David Cristiani.
    David Cristiani. says:

    That all makes sense. Yet another aspect of rejuvenation I miss by being design-only (and not having my own garden, yet) includes tasks like cleaning the cobble washes. I was fortunate my last garden, it took most of 15 years before I had to replace anything that was aged beyond help…and that was few plants.

    Another “file for future reference”.

    Reply
    • arizonaplantlady@gmail.com
      arizonaplantlady@gmail.com says:

      Hi David,

      Thank you for your observations. When I am called to help update old landscapes, my clients are often surprised that plants don’t live forever. Fifteen years is a good return for a plants that often cost less than $15, I’d say. 🙂

      Reply

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