Tag: propagating

There’s a particular kind of magic in growing something from nothing more than a snipped stem. Late July into August is one of the best windows of the whole gardening year for taking semi-ripe cuttings — that in-between stage when a shoot has started to firm up at the base but is still soft and flexible at the tip. Get it right, and by next spring you’ll have free plants: the exact lavender, rosemary, pelargonium or penstemon you already love, multiplied for nothing but a bit of patience.

It’s one of those cottage garden habits that feels almost old-fashioned, and that’s exactly the appeal. No seed catalogues, no trips to the garden centre — just your own border, a sharp pair of snips, and a windowsill.

What to take cuttings from now

Semi-ripe cuttings work best on woody or semi-woody plants: lavender, rosemary, sage, thyme, pelargoniums, penstemons, hydrangeas and many flowering shrubs are all excellent candidates in late summer. Look for a healthy, non-flowering shoot from this year’s growth — firm enough to snap slightly when bent, not floppy and soft, but not yet fully woody and stiff either.

Early morning is the best time to take cuttings, while the plant is still full of moisture from the cool of the night. A stem that’s wilted in the afternoon sun will struggle to root.

Taking the cutting

Snip a length of about 10–15cm just below a leaf joint, using clean, sharp secateurs or snips to avoid crushing the stem. Strip the leaves from the bottom third to half of the cutting, leaving just a few leaves at the tip. If the remaining leaves are large, cutting them in half reduces moisture loss while the cutting has no roots to draw water back up.

For plants like lavender and rosemary, a small “heel” — a sliver of the older, woodier stem it was attached to — can improve rooting, though it isn’t essential for most cottage garden favourites.

Potting up

Fill small pots with a free-draining mix — a standard peat-free compost cut roughly half and half with horticultural grit or perlite works well, since soggy compost is the most common reason cuttings fail. Make a hole with a dibber or pencil, insert the cutting so at least one leaf joint is below the surface, and firm the compost gently around it. Several cuttings can share one small pot around the edges, where drainage tends to be best.

Water well once, then keep the compost just barely moist rather than wet from that point on. A clear plastic bag loosely tented over the pot (held clear of the leaves with a stick or two) creates a mini greenhouse effect that keeps humidity up while the cutting has no roots of its own to take up water.

Where to keep them

A bright windowsill out of direct, scorching sun is ideal, or a shaded spot in a greenhouse or cold frame if you have one. What cuttings don’t want is full, blazing midday sun, which will dry them out long before roots have formed.

Signs of success — and patience

Resist the urge to tug on a cutting to check for roots. Instead, watch for new growth at the tip, a sign the cutting has taken and is drawing up water on its own. This can take anywhere from three to eight weeks depending on the plant. Once you see resistance when you gently tug (a good sign roots have formed, rather than a test to destruction) or new leaves emerging, it’s ready to pot on into a slightly larger container of its own.

A border that costs nothing to fill

By next spring, this year’s cuttings will be sturdy young plants ready to go into the garden — the same lavender hedge, the same rosemary you already love, quietly multiplied. It’s one of the most satisfying, lowest-cost ways to fill out a new border, fill gaps in an old one, or simply have a spare to share.

If you’d like a head start while your cuttings are rooting, I keep a running list of the small terracotta pots I use for potting on cuttings and young plants over in the Planters & Pots section of my favourites page. They’re the right size for exactly this job, and look lovely lined up on a windowsill while you wait.