Rosemary Cuttings UK: Step by Step Guide

Rosemary cuttings are one of the easiest UK plant propagations once timing is right. Take semi-ripe cuttings in late summer, dip in rooting hormone, insert into sandy compost, and 8 out of 10 will root within 8 weeks. This guide covers the timing window, the cutting technique, and the rooting media that produces UK success rates of 80-90%.

After 9 years of rosemary propagation trials at Staffordshire, the patterns are clear. Late July to early September is the best UK window. Semi-ripe cuttings outperform softwood. Sharp sand drainage decides success at the cut end.

Best UK Timing

Three rosemary cutting windows, all with different success rates.

Late July to early September is the UK best window. The current year’s growth has firmed at the base, providing rooting potential, while the tip retains the soft growth that responds to rooting hormone.

The Staffordshire trial confirmed semi-ripe cuttings outperform softwood by 20-30 percentage points every year tested.

Taking the Cuttings

Materials needed:

• Sharp clean secateurs or knife
• Pre-prepared 9cm pots filled with 50:50 sharp sand and peat-free compost
• Rooting hormone powder (Doff, Vitax, Garden Direct)
• Pencil or dibber
• Clear plastic bag or propagator lid
• Labels and pencil for variety tags

Step-by-step:

1. Choose the parent plant. Healthy, disease-free, vigorous rosemary in active growth. Avoid plants flowering heavily.
2. Select shoots. Look for current year’s growth, 150-250mm long, firm at the base, flexible at the tip.
3. Cut at 100-150mm. Use sharp clean secateurs. Cut just below a leaf node.
4. Strip lower leaves. Remove leaves from the bottom 50-75mm of the cutting. The bare stem section will sit below the compost.
5. Trim the base. Recut the bottom of the cutting at a 45° angle just below a leaf node, leaving 3-5mm below the node.
6. Dip in rooting hormone. Wet the cut end with water, then dip 25mm into rooting hormone powder. Tap off excess.
7. Insert into compost. Make a hole with a pencil. Insert cutting 50-75mm deep. Firm soil around the base.
8. Water in lightly. Use a fine rose to settle the compost.
9. Cover with plastic bag or propagator. Maintains 80-90% humidity around the cuttings.
10. Place in bright position out of direct sun. Greenhouse bench shaded, windowsill east-facing, or cold frame.

Each 9cm pot holds 3-5 cuttings spaced 25-30mm apart.

The cutting preparation: 120mm semi-ripe shoot, lower leaves stripped, base trimmed to 45° just below a node. Rooting hormone ready. 50:50 sharp sand and peat-free compost in the 9cm pot.

The Rooting Period

Cuttings root in 4-8 weeks in a UK propagator at 18-22C.

Care during rooting:

• Keep compost lightly moist but never wet
• Maintain 80-90% humidity (bag, propagator)
• Remove condensation if it pools at base of cuttings
• Open cover for 1-2 hours daily for fresh air
• Bright light but no direct hot sun
• Never feed until roots form

Signs of rooting:

• Light gentle tug meets resistance after 4-5 weeks
• Roots visible through drainage holes at 5-7 weeks
• New growth at the tip after 6-8 weeks
• Leaves remain green and healthy

Signs of failure:

• Cutting goes yellow then brown (rotting)
• Leaves drop from base upward
• Black mould on cut end
• No resistance to gentle pull at 8 weeks

The Staffordshire trial showed roughly 5-10% of cuttings fail in the first 2 weeks (these were softwood or damaged). The remaining 85-90% root successfully by week 8.

Potting On

Once roots reach 25mm, pot each cutting into its own 9cm pot.

Method:

1. Gently tip the cutting pot upside down
2. Tap out the rootball
3. Separate cuttings carefully, keeping roots intact
4. Pot each cutting individually into peat-free general compost
5. Plant at same depth as before
6. Water in
7. Move to cold frame or sheltered greenhouse for winter

Newly potted cuttings overwinter in cold frame or unheated greenhouse. Bring under cover if forecast drops below -3C. Plant out the following May after last frost.

For the wider UK plant propagation methods, our propagation guide covers division and layering for other species.

Water-Glass Method (Alternative)

UK gardeners sometimes root rosemary in a glass of water instead of compost. Lower success but simpler equipment.

Method:

1. Take cutting as above (semi-ripe, 100-150mm)
2. Strip lower 50mm of leaves
3. Place in clear glass of room-temperature water
4. Water depth 50-75mm
5. Change water every 5-7 days
6. Place on east-facing windowsill out of direct sun
7. Roots emerge in 3-5 weeks

UK success rate: 40-60%. The water-rooted plants need a 2-3 week transition period in a sand-compost mix before final potting, during which 20-30% fail.

For most UK gardeners, the soil-based method is more reliable and faster overall.

The water-rooting method on a Staffordshire windowsill. Three cuttings showing white roots emerging at week 4. Lower success rate than soil-based but simpler equipment.

Common Mistakes With UK Rosemary Cuttings

Mistake 1: taking softwood cuttings in May-June. Rotting is the main outcome. Wait until July for semi-ripe.

Mistake 2: using builders sand. Too fine, drains badly. Use horticultural sharp sand only.

Mistake 3: skipping rooting hormone. Success drops 20-30 points. Use hormone for any UK rosemary propagation.

Mistake 4: overwatering during rooting. Cuttings rot before they root. Light moisture only.

Mistake 5: planting out in autumn. Young plants killed by first frost. Overwinter under cover, plant out the following May.

Why We Recommend Late August as the Optimal UK Window

Why we recommend late August for UK rosemary cutting taking: Across 9 years of UK trial work in the Staffordshire herb garden, late August (around the 15th-30th of the month) has produced the highest single-window rosemary cutting success rate at 88-92% rooted. The growth is fully semi-ripe (firm at base, flexible at tip), the parent plant has finished its main flowering, and the cuttings have 6-8 weeks of UK growing weather to root before the cold autumn arrives. Materials cost: £4-£8 for rooting hormone, £5-£10 for sharp sand, £3-£8 for one peat-free compost bag, £2-£4 for 9cm pots. Total cost for 10-15 new rosemary plants: £15-£30. Compared to buying 10-15 garden centre rosemary at £6-£12 each (£60-£180), home propagation saves £30-£165 per batch. The method works equally well for thyme, sage, lavender, and other UK Mediterranean herbs with minor adjustments.

For the wider rosemary growing, our rosemary guide covers planting and care. For reviving a woody old rosemary, our rejuvenation guide covers hard pruning. The plant propagation guide covers other techniques.

Rosemary Cuttings Calendar UK Month-by-Month

Frequently asked questions

When is the best time to take rosemary cuttings in the UK?

Late July to early September is the best UK window. Cuttings taken at this time are semi-ripe: this year’s growth has firmed at the base but the tip is still flexible. Semi-ripe cuttings root with 80-90% success versus 50-70% for softwood spring cuttings.

Do I need rooting hormone for rosemary cuttings?

Yes for best success. Rooting hormone powder (Doff, Vitax) increases UK rosemary success from 60-70% to 80-90%. Dip the cut end in water then in the powder before inserting. Cost: £4-£8 per pack, enough for 100+ cuttings.

Can rosemary cuttings root in water?

Yes but with lower success. UK trials show water-rooting gives 40-60% success versus 80-90% in sand/compost mix. The water-rooted plants take 2-3 weeks longer to transition to soil. Soil-based propagation is more reliable for UK gardens.

How long do rosemary cuttings take to root?

4-8 weeks in a UK propagator at 18-22C. Outdoor cuttings in a cold frame: 8-12 weeks. Cuttings show roots when gentle tugging meets resistance. Pot on individually once roots are 25mm long. Plant out the following spring.

What is the best compost for rosemary cuttings?

50:50 mix of horticultural sharp sand (not builders sand) and peat-free seed compost. The sand provides drainage at the cut end where roots need air. Builders sand is too fine and waterlogs. Mix per volume, not weight.

Late August cutting take from a Staffordshire rosemary plant. 130mm semi-ripe shoot cut just below a leaf node. Firm at base, flexible at tip. The optimal UK timing.

The UK home propagation setup. Four cuttings in a 9cm pot covered with a clear plastic bag on bamboo canes. Maintains 80-90% humidity. Place on bright windowsill or shaded greenhouse bench.

A successfully rooted rosemary cutting at 8 weeks. White roots 25-30mm long. Ready for individual potting into peat-free general compost. Plant out the following May after last frost.

Now plan the wider herb garden

Rosemary cuttings are one part of UK herb propagation. Our how to grow rosemary guide covers planting and care. For reviving a woody old rosemary plant, our rejuvenation guide covers hard pruning. For the wider plant propagation methods, our propagation guide covers division and layering. And for the wider herb bed design, our allotment herb bed guide covers the wider planting and harvest plan.