Verbena Propagation: Root Cuttings in 4–6 Weeks or Start Seeds 12 Weeks Before Last Frost
Verbena cuttings root in ~6 weeks — but only from the right stem. Complete guide to cuttings and seed, matched to your verbena type.
Walk through the garden in late August and you’ll spot Verbena bonariensis doing something the catalogues don’t advertise — dropping seeds into every bare patch of soil within reach. By the following spring, dozens of seedlings crowd the gaps between perennials. I’ve had plants establish themselves in gravel paths, between paving slabs, and in a two-inch gap at the base of a wall. That’s propagation without any effort on your part.
Hybrid trailing verbenas work differently. They set barely viable seed and need you to intervene if you want more plants identical to the one you bought.
The same verb — propagate — means something quite different depending on which verbena you’re growing. Take softwood cuttings from solid side shoots and you’ll have rooted plants in about six weeks. Try the same thing with the hollow main stem of a mature V. bonariensis and you’ll have nothing but rot. Start hybrid bedding verbenas from seed and the offspring may look nothing like the parent. This guide covers both methods, for both plant types, with the timing and steps that actually work.
Know Your Verbena Type Before You Start
The genus Verbena includes plants that share a name but live very different lives in the garden. The two groups most US home gardeners encounter need different propagation strategies.
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Verbena bonariensis is a tall, airy perennial (USDA zones 7–11) with rigid, branching stems and clusters of small purple flowers that sit like landing pads for butterflies. It propagates freely from seed, sets abundant viable seed of its own, and self-seeds to the point of becoming a reliable garden fixture. Seed-grown plants come true to type. For cuttings, you must select side shoots — the main stem is hollow and will rot in propagation medium before it can root. You can also divide clump-forming verbenas in spring for immediate results, though seed and cuttings give you more new plants per effort.
Bedding and trailing verbenas (V. × hybrida and related selections) are compact tender annuals and perennials grown for their dense, colorful flower clusters. They do produce seed, but named varieties rarely come true from it — offspring are often lanky and off-color. Cuttings are the only way to reliably reproduce a specific cultivar. They’re also frost-tender, making late-summer overwintering cuttings a practical way to carry plants indoors without buying replacements next spring. For a side-by-side look at how these tender types compare to other cottage-garden plants, see our guide to lantana vs. verbena.
The steps that follow cover both types. Notes throughout flag where the two groups diverge.
Propagating Verbena From Cuttings
When to Take Cuttings
Spring — May into early June — gives you the fastest rooting and the longest season to enjoy the new plants. Softwood at this stage contains actively dividing cells at every node, which is why root initiation happens faster than with firmer late-season wood. BBC Gardeners’ World identifies summer broadly as the ideal window; within that window, late spring gives you an edge [3].
A second window opens in August. Semi-ripe cuttings taken now root more slowly but let you save non-hardy verbenas before the first frost. I’ve used this method for years to carry trailing hybrid verbenas through winter without buying replacements — pot them up, keep them frost-free on a warm windowsill or in an unheated greenhouse, and you’ll have young plants ready for hardening off the following spring [1].
Selecting the Right Stem
Choose non-flowering side shoots — not the main stem. On V. bonariensis especially, the main stem becomes hollow at maturity. A hollow stem absorbs moisture without the intact vascular tissue needed to generate roots, so the base softens and rots before any callus can form. Side shoots are solid and root reliably.
The cutting should be about 7.5 cm (3 inches) long. Strip all leaves from the lower two-thirds, leaving only one or two leaf sets at the tip. Cut just below a leaf joint: root primordia in verbena are concentrated at nodes, so a cut between nodes gives you a smaller rooting surface to work with [3].
Preparing and Planting
Rooting hormone is optional. Verbena is “extremely easy to root” and success rates are high without it [4]. That said, dipping the cut end in rooting hormone powder speeds the process and improves uniformity if you’re running multiple batches — BBC Gardeners’ World recommends it as standard practice [3].
Insert up to five cuttings around the edge of a 7 cm pot filled with gritty, free-draining compost. A mix of equal parts perlite and peat-free multipurpose compost works well: the perlite prevents waterlogging at the base of each stem, which is the fastest way to lose cuttings before roots have formed.
Water the pot well, then cover it entirely with a clear polythene bag sealed at the rim. The bag raises humidity around the leaves so the cutting doesn’t lose water faster than it can absorb, and keeps the medium consistently moist without repeated watering. Place the covered pot in a warm, bright spot — a windowsill out of direct midday sun is ideal. Heat matters more than light intensity at this stage: a heat mat set to 70°F (21°C) under the pot accelerates rooting noticeably.
The Six-Week Wait
Approximately six weeks is the standard rooting window, confirmed by both RHS and BBC Gardeners’ World [1][3]. Don’t pull cuttings to check — instead, look through the drainage holes at the base of the pot for white root tips emerging into light. Once you see them, ease each cutting out of the compost and pot it individually into a 7.5 cm container of standard potting mix.
If you see nothing at six weeks, don’t discard the cutting. Check again at eight weeks, especially for late-summer cuttings or if room temperatures have dropped below 65°F (18°C).
Growing Verbena From Seed
Seed is the right choice when you’re starting from scratch with V. bonariensis, growing a large quantity economically, or working from a species that sets reliable viable seed.
When to Sow
Start verbena seeds indoors 8 to 12 weeks before your average last frost date [2][5]. In most of the US, that means February to early March for a May transplant date. The long lead time is necessary because verbena is slow to reach transplant size: plants started indoors at 8 weeks will be noticeably smaller and later to bloom than those given 12 weeks.
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→ View My Garden CalendarThe Darkness Question: Why Sources Conflict
This is where growers hit contradictory advice. Wisconsin Horticulture Extension — one of the most reliable university sources for V. bonariensis — is explicit: “Cover the seeds with a thin layer of seeding mix, as they need darkness to germinate” [2]. Commercial grower guides from Johnny’s Selected Seeds, however, recommend only light coverage and don’t specify darkness [5].
The difference tracks the plants. V. bonariensis seeds evolved to fall into soil and overwinter before germinating — darkness is the buried-seed cue that triggers sprouting. Hybrid bedding verbena seeds, bred for consistent, fast commercial germination, are less exacting. As a practical rule: cover V. bonariensis seeds with a thin layer — about 3 mm — of seeding mix. For hybrid types, light coverage or even surface sowing usually works.
Temperature and Germination
Germination is most reliable at a consistent 21°C (70°F) [1]. Johnny’s Selected Seeds notes that alternating cooler nights (60°F/16°C) with warmer days (86°F/30°C) helps break dormancy in species verbenas — mimicking the fluctuating temperatures of early spring soil [5]. A heat mat maintains consistent warmth without relying on room temperature, which often drops at night.
Germination takes 14 to 28 days at optimal temperature [5]. Wisconsin Extension warns that V. bonariensis in particular is “slow and irregular” — a tray that looks dead at three weeks may start sprouting by week four [2]. Keep the medium barely moist rather than wet: verbena seed is sensitive to excess moisture during germination and will rot rather than sprout.
Transplanting and Pinching
Once seedlings have two sets of true leaves, pot them on into individual 7.5 cm pots or cell trays. Pinch the leading shoot when the plant has three to four sets of leaves: this redirects energy into lateral buds, producing a bushy, branched plant rather than a single upright stem [2]. Harden off for 7 to 10 days before moving outdoors permanently.
Using Self-Seeded Volunteers (V. bonariensis)
If you already grow V. bonariensis, the plant does most of this work for you. Seedlings appear each spring around the parent plant — often in cracks between paving, gravel paths, and bare soil nearby. Transplant them when they’re still small — two to three sets of leaves — with as much root ball as possible. Small plants tolerate the move far better than large ones [2]. This self-seeding habit is why many gardeners who establish V. bonariensis once rarely need to propagate it intentionally again.
Choosing the Right Method for Your Situation
| Your situation | Best method |
|---|---|
| Starting V. bonariensis from scratch | Seed — comes true to type, low cost |
| Reproducing a named hybrid cultivar | Cuttings — seeds won’t come true |
| Want plants ready this season | Spring softwood cuttings |
| Saving tender verbenas through winter | Late-summer (August) cuttings |
| Have established V. bonariensis | Transplant self-seeded volunteers |
| Large quantity at low cost | Seed |
Troubleshooting
Cuttings wilt inside the bag. Check the seal — a gap anywhere drops humidity immediately. Mild wilting in the first two or three days is normal as the cutting adjusts to living without roots. If the base of the stem shows brown discolouration, the cutting has rotted; discard and retake from a fresh side shoot, allowing the cut end to air-dry for 10 minutes before inserting.
No roots visible at six weeks. Extend to eight weeks before giving up, particularly for late-summer cuttings or if temperatures have been cool. Move the pot somewhere consistently warmer and reseal the bag.
Seeds failing to germinate after four weeks. Temperature is the most likely cause — check with a thermometer rather than guessing. If the medium has been wet rather than moist, damping off may have killed germinating seeds before they emerged. Re-sow fresh seed into barely damp medium and ensure V. bonariensis seeds are covered.
Leggy seedlings after germination. Verbena needs strong light immediately after emergence. Move to a brighter location — direct morning sun or a grow light running 12 to 14 hours daily — and pinch the tip of any seedling that reaches 10 cm (4 inches) before outdoor transplanting.
Key Takeaways
- Verbena cuttings — taken from solid side shoots, not hollow main stems — root in approximately six weeks under warm, humid conditions.
- Seed is the preferred method for V. bonariensis (starts true to type); cuttings are essential for reproducing hybrid cultivars identically.
- Start verbena seeds 8 to 12 weeks before last frost; cover V. bonariensis seeds with a thin layer of seeding mix to provide the darkness they need to germinate reliably.
For full growing guidance once your new plants are established, see the Verbena Growing Guide.
Sources
- Royal Horticultural Society. “Verbena: Growing Guide.” RHS. Accessed May 2026.
- Wisconsin Horticulture Extension, UW-Madison. “Verbena bonariensis.” University of Wisconsin Extension. Accessed May 2026.
- BBC Gardeners’ World. “How to Take Verbena Cuttings.” Gardeners’ World. Accessed May 2026.
- Gardening Know How. “Propagating Verbena Plants.” Gardening Know How. Accessed May 2026.
- Johnny’s Selected Seeds. “Verbena Key Growing Information.” Johnny’s Selected Seeds. Accessed May 2026.
