Yes, it’s still technically summer. Yes, it’s still hot enough to make you question your life choices every time you go check the mailbox. But if you’ve got a coleus, a geranium, or a begonia that’s been putting on a show all season, now is exactly the time to start thinking about its exit strategy. Frost is still weeks away for most of us, but rooting cuttings takes time, and you want your backup plants established and happy before you’re scrambling in October.
Why bother, it’s just an annual
Here’s the thing a lot of “annuals” aren’t actually annual at all. Coleus, geraniums, begonias, sweet potato vine, impatiens some of these are tender perennials that just can’t survive a frost where you live. Take a cutting now, root it indoors over winter, and you’ve got a full-grown plant ready to go back outside next May instead of starting from a tiny seedling. It’s basically a free plant, and it feels like cheating in the best way.
What actually roots well
Not everything is a great candidate, so don’t waste your time on plants that sulk. Stick to the reliable ones:
- Coleus roots almost embarrassingly fast, sometimes in water within a week
- Geraniums (pelargoniums) do well from cuttings and actually prefer a slightly dry, less-humid setup
- Begonias, especially wax and rex types, root readily in soil or water
- Sweet potato vine roots in water like it’s showing off
- Fuchsia does fine too if you’ve got one hanging around
Skip petunias and most impatiens for this method they’re cheap enough to just rebuy in spring, and the payoff isn’t worth the windowsill real estate.
How to actually do it
Take a 4 to 6 inch cutting from a healthy, non-flowering stem, cutting just below a leaf node. Strip off the lower leaves so you’ve got a bare stem to bury and a few leaves left up top. If you want to hedge your bets, dip the cut end in a rooting hormone powder before sticking it in soil it’s not strictly necessary for the easy rooters, but it speeds things up and helps with the trickier plants. A small container of rooting hormone lasts for years, so it’s a cheap thing to have on hand.
From there you’ve got two options. Water rooting is satisfying to watch and works great for coleus, sweet potato vine, and begonias just change the water every few days so it doesn’t get slimy. Soil rooting is a little more reliable long-term and skips the awkward transition period where roots grown in water have to adjust to dirt. A simple seed starting tray with a humidity dome works well for this, keeping things consistently moist without you having to babysit it.
The part everyone forgets
Cuttings taken now need bright light but not blasting afternoon sun, and they need consistent moisture while the roots establish themselves usually two to four weeks depending on the plant. Once you see new growth or feel resistance when you tug gently, they’re rooted. Pot them up individually and give them a spot near a bright window indoors before your nighttime temps start dipping into the 50s. If you wait until the first cold snap to think about this, you’ll be taking cuttings from a plant that’s already stressed and sulking, and they root a lot worse under duress. Ask me how I know.
For more on the science of why some cuttings root and others just rot into mush, the Penn State Extension guide on stem cutting propagation is a solid, no-nonsense reference if you want to get nerdy about it.
Worst case, half your cuttings don’t take and you’re out ten minutes and a few inches of stem. Best case, you walk into next spring with a windowsill full of established plants instead of a garden center receipt. That math works out pretty well in your favor.
