Sedum is one of the most well known genera of plants in cottage gardens, xeriscape gardens and commercial landscaping, with good reason.
Also called stonecrop or orpine, their reputation as an unflappable hardy perennial plant is well deserved, as they will thrive in some of the most challenging conditions we can throw at them.
Due to the botanists getting carried away and being unable to decide
where exactly each type of plant fits, it also goes by the Latin name of
Hylotelephium, generally in reference to the plants we know as Sedum
spectabile and telephium.
Other odd names that this plant gets called are bittercress, welcome-home-husband-be-thee-ever-so-drunk, and live forever.
Biting Stonecrop, Prick Madam, Wall Ginger, Mousetail, Bird's Bread,
Jack-of-the-Buttery, Golden Carpet, Gold Chain, Small Houseleek, Mossy
Stonecrop, & Creeping Tom are also common names in various places to describe Sedum acre.
Sedum sarmentosum is known as Stringy or Trailing Stonecrop, because of the way it grows and Yellow Moss, Star Sedum or Gold Moss.
Butterfly Garden Plants
Sedum for Groundcovers
Sedum can be found almost around the globe, wherever tough conditions are.
Even North America boasts several native Sedum species; Sedum lanceolatum, S. integrifolium, which is also called S. roseum, and S. stenopetalum. Sedum spathufolium and S. divergens are also native to high alpine and rocky outcroppings.
Many lovely Sedum varieties and species have been tested in Europe on green roofs, and you can’t get much more difficult conditions than that.
Green roof Sedum varieties are the most willing to face drought, thin soil and harsh environments.
These are native to the high mountains and wild places across Europe, including the Balkan Mountains and the Carpathians.
As with many other favorite garden plants, interbreeding and hybridizing has produced many superior forms with longer bloom time, stronger growth habit and different colors than the species.
Gardeners through the years across many continents have used these classic plants in sunny mixed borders alongside other drought tolerant plants, along pathways and in rock gardens – then stood back to let them strut their stuff.
Well behaved and slow spreading they seldom wear out their welcome. If they do, they’re easy to remove or prune to keep within bounds.
The species and varieties native to Europe and North America are in most cases hardy to around Zone 3, depending on winter conditions.
Full sun exposure and great drainage are key to their success.
Many Sedum are deciduous, losing all or most of their leaves in the fall.
Most of the Sedum for borders such as ’Sedum spectabile ‘Autumn Joy and Sedum telephium ‘Purple Emperor’ are typically left standing after dormancy into the winter as the seed heads are an interesting structure in the colder months.
They provide winter interest, attract birds and also capture snow and prevent it from blowing away.
Sedum for groundcovers reliably fill in gaps between taller plants, on slopes and banks for soil conservation and for non-stop seasonal interest, with textural differences, foliage and bloom colour throughout the summer and fall.
Sedum - along with most other types of plants with succulent foliage - have the ability to survive long periods without irrigation or rainfall.
Growing Sedum in a xeric garden forms the backbone for groups of other types of plants which tend to go dormant under stress, to give a presence and structure to the garden even during extended droughts.
Winter conditions are the most critical for Sedum – if high rainfall is followed by freezing temperatures many Sedum will succumb, turning into black mush.
The best way to combat this threat is to
provide extremely good drainage so no water ever puddles at the crown of
the plant. Even if the leaves and smaller twigs die back, the crown of
the plant will live to sprout again.
Ideal conditions for Sedum are those found in raised beds where you can customize the drainage, particularly in clay soils.
Adding a small amount of steer manure and a higher proportion of grit or gravel when building the bed will provide the perfect situation.
The deciduous types will benefit from a haircut in the spring to remove the dead twigs and boost new growth from around the crown.
Sedum for groundcovers tend to get a bald spot around the crown without pruning to encourage the new vigorous growth. It’s important to prune the dead stalks off before new growth starts to emerge so you don’t damage the tender sprouts.
I have used a weed whacker to take the dead flower heads off creeping Sedum in the late summer, which shapes them nicely to start fresh in the spring.
The border Sedum require cutting with shears or pruners in the spring on a case by case basis, as the stems are too tough for this cavalier treatment.
It’s not necessary to fertilize, as Sedum, along with many of their relatives prefer a lean soil.
Over fertilizing will lead to floppy weak growth and aphid infestations, as well as making them less able to withstand drought.
A small amount of worm castings around the base of the plant, or a sprinkling of a weak solution of compost tea once a season will be perfectly adequate.
Mulch with river rock or lava rock to prevent soil erosion and provide a tiny amount of micro nutrients as the mulch weathers.
Avoid using organic mulches such as wood chips or bark, as they can retain too much moisture around the crown of the plant.
With so many types and varieties of Sedum to choose from, you’ll enjoy using these versatile and hardy plants to give your xeriscape garden a buffer against drought.
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