Ornamental · Crassulaceae
Sedum
Sedum
A quietly stylish succulent for sunlit corners, sedum keeps its cool while you get on with your day.
Full sun
50–77°F · 10–25°C
USDA 3–9
4–24 in · 10–60 cm
Overview
Sedum, or stonecrop, is the kind of plant that suits a pared-back, easy-living home. A member of the Crassulaceae family, it keeps its own water in fleshy leaves and stems, so it holds its poise through the busy weeks when watering slips your mind. Hardy across zones 3 to 9, it moves easily between a bright interior shelf and a sun-washed terrace, wherever the light is good.
The genus offers a look for almost any setting. The upright kinds stand in tidy clumps and lift their flower heads late in summer, a sculptural note for a border or a generous pot. The low, creeping kinds spill and knit across the ground, made for rock gardens, gravel, and the seams between paving. Across the range, plants settle between 4 to 24 inches (10 to 60 cm) tall.
For all its easy charm, sedum keeps one firm preference: it will not sit in wet soil. Set it in gritty, fast-draining soil and good light, and it slips into a room's routine with almost no fuss. Leave it in heavy, sodden ground and the stems soften and fail, the most common way a stylish planting comes undone. Get the drainage right and the rest looks after itself.
Care
The short version: give sedum full sun and gritty, sharp-draining soil, and water it only once the mix has dried out completely. A light seasonal feed, a quick pinch of any stretched stems, and no standing water keep it looking its composed best.
Light
Sedum looks its best in full sun, a few hours a day, which keeps it compact and richly colored on the sill. Partial sun or a bright indirect corner will do indoors, though a dim spot leaves the stems long and loose, and the tidy shape starts to go.
Water
Water it well, then let the soil dry out completely before the next round, a rhythm that fits an unfussy routine. The fleshy leaves carry their own reserve, so a forgotten watering costs nothing, while a constantly damp pot invites rot. When in question, wait.
Soil
Reach for a gritty, well-drained mix that clears water fast, the single most important choice you will make for this plant. A pH between 6.0 and 7.0 suits it, but drainage outweighs the exact figure by far. Steer clear of heavy, moisture-holding soil.
Temperature
Ordinary room warmth suits sedum, which is content across 50°F to 77°F (10°C to 25°C). Outdoors, the hardy types take winter in stride through zones 3 through 9, while indoor plants ask for nothing beyond the comfort of a lived-in room.
Humidity
Dry indoor air, the kind that comes with central heating, is no trouble for sedum at all. There is no humidity to manage here. If anything, still, damp air is the thing to avoid, so give it a little space to breathe.
Feeding
Feed with a light hand from spring through summer, about once a month, using a balanced water-soluble fertilizer at half strength. Overdo it and the plant answers with soft, floppy growth that both rots and draws pests, so restraint keeps the look clean.
Pruning
When the blooms have passed, clip the spent stalks to keep the plant crisp. Pinch back any stems that have stretched so it holds a compact shape, and remove soft, rotted growth the moment it shows. It is a few minutes of tidying, no more.
Repotting
Refresh sedum with a new pot every 2 to 3 years, or sooner once the roots crowd the container and the soil drains almost as you pour. Growth that has slowed to a crawl is the other quiet signal that it wants more room.
Size & spacing
Expect a mature height of 4 to 24 inches (10 to 60 cm) by type, spreading to about 12 to 24 inches (30 to 60 cm) wide. Let the creeping kinds run and fill their space, and give the clumping kinds enough room for air to move around them.
When to plant
There is no seed-starting ritual to keep with sedum, which returns each year as a hardy perennial. Plant or divide it in spring as new growth stirs, and the flower heads arrive from summer into fall, the timing drifting a little with the species you choose to grow.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Harvest: Summer to fall depending on species
Hardiness
USDA hardiness zones: 3–9
Temperature: down to -40°C
Troubleshooting
When a sedum looks out of sorts, the cause usually sits with its water or its light, and the stems are the first to tell. Notice the early cues and the fix is simple enough to fold into a weekend. Find the look you are seeing below, then set it right.
Soft, slumping stems and a planting losing its shape
Stems that turn soft, dark, and slumped are showing rot, and it nearly always follows overwatering or a mix that will not drain. Pare the plant back to firm, sound tissue, let the pieces callus, and start them again in dry, gritty mix while the watering pauses. A pot that drains and a mix that dries fully between waterings keep the trouble away for good.
Fix:
- Cut away all soft, rotted tissue back to firm healthy growth
- Allow healthy cuttings to callus and re-root in dry, gritty mix
- Withhold water until new roots form
White cottony flecks settled in the leaf joints
Those soft white flecks with a sticky sheen are mealybugs, and left alone they slowly dull the plant's health. Touch each one with a cotton bud dipped in 70 percent isopropyl alcohol, and look the plant over again every few days until they are gone. Keep it apart from the rest of the collection for a while so nothing spreads.
Fix:
- Dab insects with a cotton swab dipped in 70 percent isopropyl alcohol
- Repeat treatment every few days until clear
- Isolate the plant from other succulents
Long, pale stems drawn toward the light
Stems that grow long and pale and lean toward the glass are showing etiolation, the reach of a sedum short on light. As it stretches, the leaves draw apart and the color washes thin, softening the tidy silhouette. Move it to a spot bathed in direct sun for several hours, then pinch the drawn tips so it fills back in. The trimmings root with ease, a small bonus for the windowsill collection.
Fix:
- Move the plant to a brighter location with several hours of direct sun
- Pinch or cut back stretched stems to encourage compact regrowth
- Use the trimmed tips as cuttings
Toxicity
For a household with pets, sedum is an easy yes. It holds no toxins that would trouble cats, dogs, horses, or other animals, and the ASPCA lists the much-loved burro's tail as non-toxic. A stray nibble might bring a little stomach upset, as any non-edible plant can, but nothing here calls for worry.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
An easy companion for cats. Should one take a taste, expect at most some light drooling or a passing bout of stomach upset, the usual response to any plant that is not on the menu.
Dogs None
Reassuring for dog owners too. The most a curious mouthful brings is a brief, passing tummy upset, which rarely happens at all.
Horses None
Safe in the company of horses, which find nothing harmful in stonecrop as they graze.
Rabbits None
Rabbits come to no harm near it. The plump leaves hold nothing toxic, though sedum belongs on the shelf as an ornamental, not in a rabbit's daily feed.
Livestock None
Untroubling for livestock. Cattle, sheep, and goats may stand near a planting safely, since stonecrops are not among the plants that poison a pasture.
Birds None
Birds are safe as well, whether kept as pets or visiting the garden, since the plant holds nothing toxic to them.
People None
Gentle to handle, and a few kinds of stonecrop have been eaten sparingly over the years. Even so, sedum earns its keep as something to look at rather than to serve.
Varieties
With hundreds of species to its name, sedum ranges from upright clumps to flat, spreading mats. The three below are the ones you will meet most often and the easiest place to begin.
Sedum spectabile / 'Autumn Joy'
The upright border favorite, its fleshy stems topped with wide pink flower clusters that mellow to rust by fall.
Sedum acre
Goldmoss stonecrop, a low, spreading carpet of tiny yellow-green foliage lit by a scatter of yellow bloom.
Sedum spurium
A trailing, mat-forming sedum whose rounded, scalloped leaves make it a mainstay of rock gardens and green roofs.
How to propagate
Sedum is generous in the nicest way: it multiplies almost on its own. A single dropped leaf will often take root where it lands, so one plant quietly becomes many, ready to share or to fill a new pot.
Stem cuttingsEasy
Spring through summer during active growth · 2 to 3 weeks to root
The season for stem cuttings runs through spring and summer, while growth is active. Let the cut ends dry and callus over a day or so, then settle them into gritty mix kept only just moist. Roots take hold in about 2 to 3 weeks.
Leaf cuttingsEasy
Spring through summer · 3 to 6 weeks to form plantlets
Right through spring and summer, a single leaf can become a whole new plant. Rest the leaves on dry, gritty mix and leave them undisturbed; small rooted rosettes gather at the base within about 3 to 6 weeks.
DivisionEasy
Early spring · 2 to 4 weeks to settle
The clumping border types divide neatly in early spring. Lift the clump, ease the rooted pieces apart, and set each back at the depth it grew before, where it takes hold over 2 to 4 weeks.
Myths
Succulents like sedum live on pure neglect and never call for water.
Sedum weathers dry spells gracefully, yet during active growth it still welcomes a thorough soak now and then. The real hazard runs the other direction. What undoes these plants is too much water, not the occasional dry stretch.