Planting Guide

How to Plant and Grow Sedum in Canada

Sedum, commonly known as stonecrop, is a hardy succulent perennial valued for its colourful foliage, low-maintenance growth and excellent drought tolerance. Its star-shaped clusters of flowers also provide an important source of nectar for bees and other pollinators.

Sedum varieties generally fall into two groups. Low-growing Sedum forms spreading mats that work well in rock gardens, containers and along pathways. Upright Sedum produces taller flower stems and is commonly planted in perennial borders and pollinator gardens.

This guide covers the planting and care of hardy outdoor Sedum in Canada, including potted plants such as Sedum Atlantis and bare-root varieties.

When to Plant Sedum in Canada

Plant Sedum in spring once the soil is workable and no longer frozen or waterlogged. Coast Farms ships spring plants at the appropriate planting time for each Canadian region.

Potted Sedum can also be planted in early fall. Allow at least four to six weeks before the ground normally freezes so the roots have time to establish.

Plant bare-root Sedum promptly after delivery. If the roots appear dry, soak them in clean, room-temperature water for 1–3 hours before planting.

Where to Plant Sedum

Choose a location that receives at least six hours of direct sunlight each day. Some Sedum varieties tolerate light shade, but full sun generally produces stronger growth, more flowers and better foliage colour.

Excellent drainage is essential. Sedum grows well in:

Sandy or gravelly soil
Rocky or shallow soil
Rock and gravel gardens
Raised beds
Containers with drainage holes
Sunny perennial borders
Pollinator and drought-tolerant gardens

Avoid low areas where water collects after rain or snowmelt. Sedum stores water in its succulent leaves and can develop crown or root rot in constantly wet soil.

If your garden has heavy soil that remains wet, consider planting Sedum in a raised bed or container filled with a free-draining growing mix.

How to Plant Potted Sedum

Coast Farms Sedum Atlantis is supplied as a young potted plant.

Water the plant lightly before removing it from its container.
Dig a hole slightly wider than the root ball and approximately the same depth.
Carefully remove the plant from its pot without damaging the succulent stems or leaves.
Position the top of the root ball level with the surrounding soil. Avoid burying the crown or fleshy stems.
Backfill with soil and firm it gently around the roots.
Space Sedum Atlantis approximately 30 cm (12 inches) from neighbouring plants.
Water thoroughly after planting and allow excess water to drain away.

How to Plant Bare-Root Sedum

Unpack the roots as soon as they arrive.
If they appear dry, soak them in water for 1–3 hours.
Dig a hole wide enough to accommodate the roots without bending or crowding them.
Position the crown at soil level with the roots beneath the soil. Any emerging shoots or leaves should remain above ground.
Spread the roots gently outward.
Backfill with soil, firm lightly and water thoroughly.
Follow the spacing listed for the individual variety because mature sizes vary considerably between low-growing and upright Sedum.

Sedum Care

Watering

Water newly planted Sedum whenever the upper layer of soil feels dry. The goal is to help the roots establish without keeping the soil constantly wet.

Once established, Sedum is highly drought tolerant and usually needs additional water only during extended periods of hot, dry weather. Sedum grown in containers may need watering more frequently because containers dry out faster than garden soil.

Feeding

Sedum usually performs well without regular fertilizer. Excess fertilizer, particularly nitrogen, can cause soft growth and make upright varieties more likely to flop.

If the soil is very poor, apply a small amount of compost in spring. Avoid heavy feeding.

Pruning Low-Growing Sedum

Low-growing varieties such as Sedum Atlantis require little or no pruning. Remove damaged growth or faded flower stems as needed. Plants can be trimmed lightly after flowering if they begin spreading beyond their intended area.

Do not cut Sedum Atlantis back by half in late spring. That technique is intended for taller, upright Sedum varieties.

Pruning Upright Sedum

Upright Sedum can be cut back after flowering, or its dried flowerheads can be left standing through winter for structure and wildlife value. Remove the old stems in late winter or early spring before new growth begins.

Tall varieties that tend to become floppy can be cut back by approximately one-third to one-half in late May. This optional technique encourages shorter, bushier growth but may delay flowering slightly.

Dividing Sedum

Divide established Sedum in spring if the clump becomes crowded, develops a bare centre or begins flowering less vigorously.

Lift the plant carefully, separate it into healthy sections and replant each section at its original depth. Low-growing varieties can also be propagated from stem cuttings.

Winter Care

Sedum planted in the ground normally needs no special winter protection when it is grown within the variety’s recommended hardiness zones. Sedum Atlantis is suitable for Zones 4–9.

Good winter drainage is especially important. Cold, wet soil is more damaging to Sedum than cold temperatures alone.

Container-grown Sedum has less insulation around its roots. In colder regions, move containers to a sheltered location or insulate the pot while ensuring that drainage holes remain open.

Sedum Quick Facts

Common name: Stonecrop
Plant type: Hardy succulent perennial
Planting season: Spring or early fall
Light: Full sun
Soil: Sandy, rocky or gravelly and very well-drained
Water needs: Low once established
Sedum Atlantis spacing: 30 cm (12 inches)
Sedum Atlantis height: Approximately 15 cm (6 inches)
Sedum Atlantis hardiness: Zones 4–9
Best uses: Rock gardens, gravel gardens, borders, containers and pollinator gardens

Frequently Asked Questions

Is Sedum the same as stonecrop?

Yes. Stonecrop is the common name used for many plants in the Sedum genus. Some upright varieties have been reclassified as Hylotelephium but are still commonly sold and recognized as Sedum.

Does Sedum come back every year?

Hardy perennial Sedum returns each spring when planted within its recommended hardiness zone. Some tender Sedum species grown as houseplants cannot survive Canadian winters outdoors, so always check the specific variety.

Can Sedum grow in shade?

Some varieties tolerate light or partial shade, but most outdoor Sedum grows best in full sun. Excessive shade can cause weak growth, reduced flowering and flopping in upright varieties.

Why is my Sedum becoming soft or yellow?

Soft, yellow or collapsing growth often indicates excessive moisture or poor drainage. Allow the soil to dry and check that water can drain freely from the planting area or container.

Should Sedum be cut back before winter?

Low-growing varieties generally do not need to be cut back. Upright Sedum can be cut down after flowering or left standing through winter and cleaned up in early spring.

Does Sedum spread?

Low-growing Sedum spreads gradually along the soil and can form a dense groundcover. Upright Sedum usually develops into an expanding clump rather than spreading across the ground.