Broadleaf Stonecrop

Year-round

Establish it with a little water, then let Seattle's own wet-winter, dry-summer rhythm do the rest. Drainage is what keeps this stonecrop alive here.

• Water new plantings every few days through the first summer while roots establish, then stop supplemental watering.
• Once established, it needs no regular water. Seattle's dry summers and wet winters mirror the rocky slopes it grows on in the wild.
• Use gravel or mineral mulch instead of bark or wood chips. Organic mulch holds moisture against the crown and invites rot in our wet winters.
• Plant on a slight angle or in a raised spot so water runs off the crown rather than pooling.
• The most common mistake is planting it in heavy, unamended clay or a low spot that stays soggy through the rainy season. That's what kills it, not cold or drought.
• It's native along the coast from British Columbia down through California, so it's genuinely at home in Puget Sound gardens.

Its low, tidy mat habit and long bloom season read as neat rather than wild, an HOA-friendly choice for a rock garden edge or border without looking unkempt.

Fall

As the rain returns, cut back spent stems and let the plant settle in for winter.

• Cut spent flowering stems to the ground after bloom finishes, standard fall guidance for maritime Northwest gardens.
• Fall is a good second planting window. Cooler air and returning rain make it easy for new plants to root before winter.
• Check drainage before the rains arrive. Make sure the crown isn't sitting in a spot that will pool water this winter.
• Stop any supplemental watering once fall rain becomes regular, usually by October.

Winter

Winter care here is about drainage, not cold protection. Seattle's mild winters rarely threaten this plant.

• No winter protection needed. Established plants handle Seattle's typical winter lows without covering.
• The real winter risk is standing water from heavy rain, not frost. Confirm the site drains within a few hours after a storm.
• Leave it be. This is a dormant, low-growth period with nothing to prune or fertilize.
• If it's planted in a container, make sure drainage holes aren't blocked. Saturated potting soil is the fastest way to lose it over winter.

Spring

Spring is planting and dividing season, before Seattle's summer dry stretch sets in.

• Plant or divide clumps in March or April, while soil is still workable from winter rain.
• New growth resumes now. Watch for slug and snail damage on the leaves, common in wet Pacific Northwest springs.
• Water new divisions in for the first few weeks if spring rain tapers off early.
• Top-dress with a thin layer of gravel to refresh the mineral mulch after winter settling.

Summer

This is Seattle's dry season, exactly what this plant expects, so it's mostly hands-off.

• No supplemental water needed for established plants during Seattle's dry summer. This is its natural rest period.
• If you're in full sun near pavement or a south-facing wall, an occasional deep watering during a multi-week dry stretch helps color and vigor.
• Full sun brings out the best flowering and leaf color. Part shade is fine but blooms less.
• Leave the flowering stems in place until bloom finishes, usually by August.

Year-round

Broadleaf stonecrop is a low evergreen succulent that is native right here, and in the Willamette Valley the whole job is keeping it out of soggy winter clay.

• It grows as a tight mat of spoon-shaped rosettes only a few inches tall, with yellow star flowers on short stems from May into August.
• It is native to California, Oregon, and Washington, where it grows naturally on rocky slopes and ledges.
• Full sun to part shade both work, but the soil has to drain fast. Gravel, a slope, a rock crevice, a raised spot, or a container are all good homes for it.
• Heavy valley clay that stays saturated from November through April is what kills this plant, not the rainless summer. It is built for the dry season.
• Set each plant tilted slightly so rain runs off the center of the rosette instead of pooling in it.
• The yellow flowers feed butterflies and native bees, and the leaves are the larval food plant for Moss's elfin butterfly.

Fall

Fall is the season that decides whether this plant survives, because everything you do in October is really about shedding the winter rain.

• Early October is the best planting window. The soil is still warm, roots settle in, and the returning rains do the watering for you.
• Before the rains set in around November, top-dress around the rosettes with a half inch of coarse grit or pea gravel so water drains away from the crowns.
• Keep bark mulch and compost off the plant. Wet organic mulch pressed against the leaves is a direct path to crown rot.
• Sweep or rake fallen maple, oak, and birch leaves off the mat every couple of weeks through October and November. A leaf blanket holds water on the plant all winter.
• Cut and remove the dried flower stems now if you left them up over summer.
• If a spot held standing water last winter, move the plant in October to a slope, a wall top, a rock crevice, or a container. Relocating beats amending in heavy clay.

A raked, gravel-topped patch reads as deliberate groundcover heading into the wet months, which is the look that keeps an HOA-conscious front yard off the complaint list.

Winter

Winter is the dangerous season here, and the plant asks nothing of you except that it not be sitting in water.

• The cold is not the issue. Our 8b to 9a winters are well within what this plant handles, and it stays evergreen straight through.
• Saturated soil is the issue. Months of waterlogged clay will rot the crowns even in a mild, frost-free winter.
• Do not water at all from November through March. The 36 to 43 inches of rain we get, most of it in these months, is already far more than it wants.
• Skip winter covers, fleece, and any mulch laid over the top. Anything that traps moisture against the rosettes makes the problem worse.
• Tip containers slightly or set them on pot feet so drain holes stay clear and the pot never sits in a saucer of rainwater.
• Check the patch in late January. Firm rosettes with red or purple winter tones are healthy. Soft, translucent, or collapsed ones are rot and should be pulled out right away.

Because the rosettes hold their shape and color all winter, the bed keeps a neat, intentional look in the months when most perennial plantings look bare.

Spring

Spring is for cleanup, planting, and dividing, all done early enough that the mat fills back in before the May flowers open.

• In late February, before new growth pushes, pick out any rosettes that went soft, translucent, or brown over the winter. Those are rot and they will not recover.
• Plant or divide from March through April, once the clay crumbles instead of smearing. Broken-off rosettes and rooted sections take hold easily.
• Mix coarse grit or small gravel into the top few inches before planting, or better, plant into a raised gravel pocket, a wall top, or a container.
• Skip fertilizer entirely. This plant evolved on thin, poor, rocky ground and gets loose and floppy in rich soil.
• Water new plantings lightly through April and May until you see fresh growth at the center of each rosette, then taper off.
• Yellow flower stems come up in May. Leave them standing, they feed butterflies and bees through early summer.

Pulling the winter-damaged rosettes in late February keeps the patch reading as intentional planting rather than something that died over the wet season.

Summer

Summer is the easy season, because an established plant can ride out the valley's rainless June through September on almost no water.

• Once established, water once a month at the very most. Many plantings here get through the whole dry stretch on nothing at all.
• First-summer plants are the exception. Give them a slow soak every two or three weeks through July and August while the roots take hold.
• Keep lawn sprinklers and drip lines off this patch. Repeated overhead water in warm weather is the quickest way to lose rosettes.
• Leaves that shrivel slightly or flush red in a heat wave are storing water, not asking for it. Leave them alone.
• When the yellow flowers finish in July or August, snip the spent stems at the base if you want a flat mat, or leave them to set seed.
• On a hot west-facing wall or driveway strip, a little afternoon shade keeps the blue-grey color better. Part shade suits it fine.