15 Plants That Spread Naturally
Bare patches have a way of making even a well-planted garden look unfinished. Plants that spread naturally can solve the problem by knitting around stepping stones, softening border edges and forming generous drifts without being replanted every year.
They do not all travel in the same way. Some send stems across the soil and root as they go, some expand through underground rhizomes, and others scatter seedlings into nearby gaps. Understanding that habit is the difference between a useful living carpet and a plant that turns up where it is not wanted.
The 15 plants below include choices for sun, shade, dry rock gardens and moist woodland beds. None is suitable for every climate, and a well-behaved garden plant in one region can be troublesome in another. Check local invasive-plant guidance before planting, then give each spreader a space where its natural growth is an advantage.
Before You Plant a Natural Spreader
- Match the plant to the site. Sun, shade, drainage and moisture often determine how quickly it spreads.
- Learn whether it travels by runners, rooting stems, rhizomes or seed, because each habit needs a different control method.
- Keep vigorous plants away from lawns, delicate alpine plants and the crowns of slower perennials.
- Use paths, walls, containers or regularly mown edges as practical boundaries.
- Remove unwanted seedlings while they are small and thin expanding colonies before they become congested.
- Never allow a garden spreader to escape into natural areas, and do not plant a species listed as invasive in your region.
Hardiness zones and mature sizes are useful planning guides, but named cultivars can behave differently from the species. Confirm the label on the plant you buy and leave enough room for the colony you actually want.
1. Creeping Thyme
Creeping thyme (Thymus serpyllum and related low-growing thymes) forms a close, aromatic mat dotted with tiny pink or purple flowers. Its small leaves and low profile make it especially effective around warm paving, gravel and rocks.
At a glance: Evergreen to semi-evergreen perennial; usually 2–4 inches tall and 12–18 inches wide; commonly hardy in USDA zones 4–8; full sun; dry to medium, sharply drained soil.
Trailing stems spread over the ground and root where they remain in contact with suitable soil. The plant grows best in lean, gritty conditions and can rot in heavy or persistently wet ground. Trim lightly after flowering if the mat becomes woody or starts covering the edges of nearby plants.
Best use: Let it fill narrow cracks, drape over a low wall or run between stepping stones that receive only occasional foot traffic. A hard path edge makes unwanted stems easy to spot and clip.
2. Ajuga
Ajuga, or bugleweed (Ajuga reptans), creates a low carpet of green, bronze, chocolate or variegated foliage. Short blue-violet flower spikes appear above it in spring, bringing color to areas where many flowering ground covers struggle.
At a glance: Semi-evergreen perennial; roughly 3–9 inches tall; USDA zones 4–9; full sun to partial shade; average, moderately moist, well-drained soil.
Ajuga sends out aboveground stolons that form new rooted rosettes. It can fill a bed quickly in moist, favorable conditions, so pull or cut runners before they enter lawn grass or smaller plants. Give the crowns air and drainage because dense, wet growth is vulnerable to crown rot.
Best use: Plant it beneath shrubs, beside a shaded path or on a contained slope where a continuous mat is welcome. Avoid placing it next to wild woodland or other areas into which it could escape.
3. Lamb’s Ear
Lamb’s ear (Stachys byzantina) is grown mainly for thick, velvety silver leaves that brighten a sunny border. Established plants make a soft-edged colony, while woolly flower stalks rise above the foliage on flowering forms.
At a glance: Herbaceous or semi-evergreen perennial; foliage about 6–9 inches tall with taller flower stems; USDA zones 4–8; full sun; dry to medium, well-drained soil.
Low stems root as the clump expands, and seedlings can add to the colony where flower stalks are left standing. Remove tired leaves after wet weather, divide overcrowded patches and cut off flowers before seed ripens if you want a neater edge. Heat, high humidity and poor drainage are its main enemies.
Best use: Repeat it along a dry path or use it as a silver ribbon beneath roses and upright perennials. A nonflowering cultivar such as ‘Big Ears’ is useful when foliage matters more than self-seeding flowers.
4. Sweet Woodruff
Sweet woodruff (Galium odoratum) brings starry white spring flowers and neat whorls of leaves to moist shade. Its fine texture looks especially natural beneath deciduous trees, where it can weave between bulbs and other spring woodland plants.
At a glance: Herbaceous ground cover; about 6–12 inches tall; USDA zones 4–8; partial to full shade; humus-rich, medium to moist soil.
Creeping roots extend the patch, and the flowers can also produce seedlings. Growth can be enthusiastic in cool, consistently moist soil but much slower in dry shade. Pull the shallow outer shoots after rain or use a path as a boundary; do not let the colony bury small, slow-growing companions.
Best use: Give it a roomy woodland bed where a broad spring carpet is the goal. It may go partly dormant during a hot, dry summer, so pair it with later-emerging shade plants rather than expecting flawless foliage all season.
5. Wild Strawberry
Wild strawberry (Fragaria virginiana) combines toothed three-part leaves, small white spring flowers and tiny red fruits. The berries are much smaller than supermarket strawberries, but the plant makes a useful native ground cover where its roaming habit has room.
At a glance: Ground-hugging perennial; usually 4–7 inches tall; broadly hardy across cold and temperate North American gardens; full sun to partial shade; average to dry, well-drained soil.
Long runners, or stolons, travel over the ground and form a new rooted plant at each suitable node. Redirect young runners into bare spaces and snip the rest before they enter a lawn or neighboring crown. Older mats can be thinned after fruiting to improve air circulation.
Best use: Let it colonize a sunny bank, open woodland edge or informal border where both flowers and small fruits can be enjoyed. Buy from a reputable native nursery so you receive the intended species for your region.
6. Woodland Violets
Common blue violet (Viola sororia) has heart-shaped leaves and spring flowers that may be violet-blue, white or bicolored. It fits naturally around deciduous trees and shrubs, where the low foliage can cover soil without obscuring larger woodland plants.
At a glance: Low herbaceous perennial; roughly 6–9 inches tall; USDA zones 3–7; full sun to partial shade; humus-rich, moisture-retentive but drained soil.
This violet is rhizomatous, but its most noticeable garden spread often comes from abundant self-seeding rather than surface runners. Leave seedlings to build a natural drift, or remove flower stalks and pull young plants where a crisp formal edge matters. Foliage may look tired during very hot weather.
Best use: Allow it to naturalize under shrubs, along a lightly shaded walk or in a native woodland garden. It also supports wildlife, including butterflies whose caterpillars use violets as host plants.
7. Bee Balm
Bee balm (Monarda didyma) produces shaggy red, pink or purple flower heads above aromatic foliage. A healthy group becomes a conspicuous summer feature and attracts bees, butterflies and hummingbirds.
At a glance: Herbaceous perennial; commonly 2–4 feet tall and 2–3 feet wide; USDA zones 4–9; full sun to partial shade; rich, medium to moist soil with good drainage.
Underground rhizomes enlarge the clump, while uncut flowers can add seedlings. Divide every few years, remove outer rhizomes that cross their boundary and deadhead if you do not want seed. Good spacing and air circulation are important because crowded, drought-stressed foliage is prone to powdery mildew.
Best use: Grow bee balm in a cottage border, pollinator bed or moist naturalistic planting where a broad midsummer colony is welcome. Mildew-resistant cultivars make a tidier choice for a prominent front garden.
8. Yarrow
Yarrow (Achillea millefolium) carries flat flower clusters over finely cut, aromatic foliage. The species usually flowers white, while garden selections extend the palette through yellow, apricot, rose and red.
At a glance: Herbaceous perennial; about 2–3 feet tall and wide; USDA zones 3–9; full sun; lean, dry to medium, well-drained soil.
Yarrow spreads through rhizomes and seed, and the species can form a substantial colony when left alone. Divide or lift the outer growth every two or three years, and remove fading flower heads if seedlings are unwanted. Rich, wet soil encourages weak, floppy stems rather than a better display.
Best use: Place it in a sunny meadow-style border, gravel garden or dry bank where neighboring plants are equally robust. A named ornamental cultivar is often easier to integrate into a designed border than an unidentified seed-grown plant.
9. ‘Angelina’ Stonecrop
‘Angelina’ stonecrop (Sedum rupestre ‘Angelina’) forms a vivid mat of narrow, succulent leaves. The foliage is yellow to chartreuse in warm weather and often develops orange, copper or reddish tones when temperatures fall.
At a glance: Evergreen succulent perennial; about 3–6 inches tall and 1–2 feet wide; USDA zones 5–8; full sun; dry to medium, sandy or gravelly soil with excellent drainage.
Trailing stems root readily, and even detached pieces can establish in loose soil. Lift unwanted pieces before they root, or shear the mat back from a path after flowering. Avoid rich soil and frequent irrigation; damp, fertile conditions make the plant less compact and increase the risk of rot.
Best use: Tuck it between rocks, allow it to spill over a wall or use it as bright edging in a dry garden. Its shallow growth is easy to remove from gravel, making it a useful spreader where firm boundaries are visible.
10. Hardy Geranium
“Hardy geranium” covers many perennial cranesbills, so choose the species as carefully as the flower color. Bigroot geranium (Geranium macrorrhizum) is a particularly useful natural spreader, forming an aromatic, weed-resistant ground cover with pink-purple late-spring flowers.
At a glance: Semi-evergreen herbaceous perennial; about 12–18 inches tall and 1–2 feet wide; USDA zones 4–8; full sun to partial shade; average, dry to medium, well-drained soil.
Thick rhizomes move outward beneath the foliage, and seedlings may appear around species plants. Cut or pull the outer rhizomes when they reach a path or smaller neighbor, and divide established clumps to create more ground cover elsewhere. This is a true hardy geranium, not a tender bedding pelargonium.
Best use: Use it beneath open shrubs, on a bank or along the front of an informal border. It tolerates drier soil once established and usually needs less cutting back than sprawling, long-flowering cranesbills.
11. Ostrich Fern
Ostrich fern (Matteuccia struthiopteris) produces tall, vase-shaped crowns of finely divided fronds. In a cool, moist setting, a few plants can develop into a dramatic woodland colony with a strong architectural presence.
At a glance: Deciduous fern; commonly 3–6 feet tall and capable of spreading 5–8 feet; USDA zones 3–7; partial to full shade; rich, medium to wet soil.
Underground rhizomes send up new crowns at a distance from the parent. Remove young satellite crowns in spring or sever the connecting rhizomes with a sharp spade before the colony becomes dense. The soil should not be allowed to dry out, and windy or hot southern sites are a poor match.
Best use: Give it a broad, moist woodland bed, stream edge or shaded rain garden where large-scale naturalizing is the point. Do not place it in a narrow border among delicate plants unless you are willing to edit the colony every year.
12. Woodland Phlox
Woodland phlox (Phlox divaricata) carries loose clusters of lightly fragrant blue, lavender or rose flowers in spring. The soft, flowing display is less formal than a clipped ground cover and works beautifully beneath leafing trees.
At a glance: Herbaceous perennial; about 9–15 inches tall; USDA zones 3–8; partial to full shade; humus-rich, moderately moist, well-drained soil.
Leafy shoots creep along the ground and root at their nodes, gradually building a wider colony. Cut stems back after flowering if the patch needs reshaping; this also removes tired growth and can reduce powdery mildew. A light summer mulch helps keep its shallow roots cool.
Best use: Plant it at a woodland edge, around spring bulbs or beside a shaded path where its mat can broaden naturally. It is a gentler-looking choice than many evergreen ground covers, although rabbits may browse new shoots.
13. Black-Eyed Susan
For a dependable perennial colony, look for orange coneflower or perennial black-eyed Susan (Rudbeckia fulgida) rather than assuming every plant sold under the common name behaves identically. Its golden daisies with dark centers bring strong color from midsummer into fall.
At a glance: Herbaceous perennial; about 2–3 feet tall and 1–2 feet wide; USDA zones 3–9; full sun; average, dry to moderately moist, well-drained soil.
The clump slowly expands through rhizomes and can form a colony over time. Lift the outer crowns when it outgrows its space, and deadhead for a tidier look or leave some seed heads for birds. Good air movement helps reduce leaf spot and mildew.
Best use: Mass it with ornamental grasses and sturdy late-season perennials in a sunny border or meadow garden. Rudbeckia hirta, also called black-eyed Susan, is usually shorter lived and often maintains itself mainly by self-seeding.
14. Native Columbine
Eastern red columbine (Aquilegia canadensis) has nodding red-and-yellow flowers held above delicate blue-green foliage. Hummingbirds visit the spring blooms, and the plant looks at home in rocky woodland gardens where seedlings can choose their own positions.
At a glance: Herbaceous perennial; about 2–3 feet tall and 1–1½ feet wide; USDA zones 3–8; full sun to partial shade; average, well-drained soil with moderate moisture.
Columbine spreads chiefly by dropping seed rather than by forming a creeping mat. Let the pods ripen for an informal colony, or cut the flower stems after bloom to prevent most volunteers. Move desirable seedlings while small and remove any that settle in paving joints or crowded crowns.
Best use: Scatter it through a lightly shaded rock garden, cottage border or native woodland edge. Native range matters: choose a columbine indigenous to your part of North America rather than treating one species as native everywhere.
15. Pussytoes
Plantain-leaved pussytoes (Antennaria plantaginifolia) is a woolly native perennial with silver-gray leaves and small spring flower clusters. Its restrained color and ground-hugging habit complement stone, gravel and drought-tolerant plants.
At a glance: Mat-forming herbaceous perennial; foliage stays low while flower stems reach about 6–12 inches; USDA zones 3–8; full sun; lean, dry to medium, gritty or rocky soil.
Stolons move across the soil and root into a wider mat when conditions suit the plant. It spreads poorly in fertile, damp ground and may disappear if drainage is inadequate. Where it thrives, unwanted outer rosettes are shallow and can be lifted with a hand fork.
Best use: Grow pussytoes in a sunny rock garden, dry slope or gravel edge where its silver foliage can be seen up close. The plant is also a larval host for American lady butterflies, adding ecological value to a small native ground-cover patch.
How to Keep Spreading Plants Under Control
- Runners and rooting stems: Lift or snip them before the next node roots, and redirect useful growth into empty soil.
- Rhizomes: Cut around the desired colony with a sharp spade, then remove the severed outer pieces and every visible growing point.
- Self-seeders: Deadhead before seed ripens, mulch open soil and pull young seedlings after rain.
- Dense mats: Thin the oldest center growth periodically so air and water can reach the remaining crowns.
- Garden boundaries: Paths, mowing strips, walls and large containers make routine editing quicker and more obvious.
- Disposal: Follow local guidance for vigorous or invasive plants; do not dump live roots, runners or seed heads in natural areas.
Choose the Spread You Actually Need
The most useful natural spreader is not necessarily the fastest one. Creeping thyme and ‘Angelina’ stonecrop suit sunny, dry edges; sweet woodruff, violets and woodland phlox favor shade; ostrich fern needs far more moisture and room. A plant that struggles in the wrong site will not cover soil attractively, while one given ideal conditions may need regular limits.
Start with a small group, watch how it moves for a full growing season and expand only when you like the result. With the right plant in the right boundary, natural spreading creates the relaxed, mature look of a garden that has filled itself in over time.
