You're aware of autumn in sun and shadows, shorter days and drier air, and so is your garden. Smart plant parents also are attuned to wind, rain and frost. And they're vigilant. Succulents that have yet to recover from summer heat and sun are especially vulnerable to pests.
These seasonal succulent must-do's are mainly for southern and coastal CA, from the Bay Area south. If you live beyond, please visit my site's Succulents By Season and Region page.
In September and October...
(1) Aeoniums and senecios are emerging from summer dormancy. Cut back leggy aeoniums, save the rosettes, and discard old plants roots and all. See how in my video, How to Refresh an Overgrown Succulent Garden.
(2) Trim Senecio mandraliscae back several inches, and plant cuttings in gaps. Old stems branch where cut, which helps mass plantings look fuller. See my new video, How to Fill Gaps in Your Succulent Garden.
(3) Spread pre-emergent herbicide. This nontoxic, granulated powder stops seeds from germinating. Spread it, before the first rainstorm, wherever you don't want weeds. More.
(4) Check your garden's run-off. Create channels that divert rain from succulents growing in low spots. If they sit where water collects, they may rot.
(5) Treat agaves for snout weevil. This essential preventative needs doing in spring and fall. It also saves infested plants if caught early. More.
(6) Create a lovely wreath that'll transition from fall into winter. See my video: Make an Autumn-Themed Succulent Wreath DIY (3:58).
(7) Fertilize in-ground succulents before a rainstorm with Ironite. It's optional, but it does promote lush spring growth. Don't let it stain hardscape.
(8) Scrub cochineal scale off opuntia pads. Remove the bumpy white colonies with a soft-bristled shower brush dipped in Safer soap. Read the article. See the video.
(9) Check for ants in outdoor potted succulents, especially haworthias, gasterias and aloes. A tell-tale sign is soil in the crowns, pushed up from below. What to do.
(10) Heat, sun and Santa Ana winds can desiccate succulents. Cuttings are vulnerable because they lack roots, so start them once the winds die down.
Cochineal Scale on Paddle Cactus, What To Do
White fuzzy lumps on paddle cactus indicate the presence of a parasite that pierces the plant’s skin and consumes its juices. A bit of cochineal (coach-en-ee-al) scale is no big deal, but it does tend to spread and may eventually kill the plant. Your first line of defense is to blast what appears to be…
Agave Snout Weevil Prevention and Treatment
Agave experts, growers, and pest management specialists advise drenching the soil around healthy agaves with a systemic insecticide containing imidacloprid.* Untreated agaves are at high risk of infestation. If treated early enough, an infested agave may survive. The agave snout-nosed weevil is a half-inch-long black beetle with a downward-curving proboscis that enables it to pierce an agave’s…
Succulent Pests, Large and Small
Common succulent pests, diseases, and problems include agave grease mite, aloe mite, ant infestation, aphids, black spots, cochineal scale, deer, desiccation, etiolation, frost, gopher, hail, mealy bugs, mildew, rabbit, rot, snails and sunburn. Also find out how NOT to deal with a skunk!
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