Category: Alpines and Rock Gardens Groundcovers Perennials
Height: under 6 in. (15 cm)
Spacing: 6-9 in. (15-22 cm) 9-12 in. (22-30 cm)
Hardiness: USDA Zone 2a: to -45.5 °C (-50 °F) USDA Zone 2b: to -42.7 °C (-45 °F) USDA Zone 3a: to -39.9 °C (-40 °F) USDA Zone 3b: to -37.2 °C (-35 °F) USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F)
Sun Exposure: Full Sun
Bloom Color: White/Near White
Bloom Time: Late Spring/Early Summer
Foliage: Silver/Gray Velvet/Fuzzy-Textured
Other details: May be a noxious weed or invasive Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds
On May 15, 2013, sladeofsky from Louisville, KY (Zone 6b) wrote:
I have read very conflicting reports about this plant's ability to withstand heat an humidity. This is my second year growing it and so far it is doing well and trust me, it is very hot and humid here in Kentucky.
This plant is tough as nails and gorgeous. The largest mat of it is growing under an old crab apple in the center of a raised and sloping bed that seems to consist of gravel, sand and bark. (former owner) This bed gets plenty of water, due to other species there that need it. I have transplanted some to the front border, where it is in full sun all day and is quite dry. Seems to love it there, as well.
Can't say enough good things about this plant. It is often windy and dry here (zone 5) in summer and wet and cold/frozen in winter. Just a super beautiful, dependable groundcover, sun or shade. (not full shade-dappled morning and afternoon full shade)
This plant grows well in Merced, CA. Due to the gray appearance of its leave, I am hoping it will be deer resistant in Mariposa, CA. It grows there, but so far the deer have not noticed the small area where it is hidden.
On Oct 12, 2011, fionaly from Worcester United Kingdom wrote:
This such a cheerful, pretty trailing/thickly sprawling plant,and so generous in its longevity! Softly tactile, silver grey leaves and the sweetest unpretentious white flowers. It reminds me of my childhood (in north-western England) it grew on a low, wide stone-topped wall, which divided our little front garden from our neighbours'; it seemed to be flowering for months and months on end, and it never actually died! We used to call it 'White Rock'. My father still has some, grown from the original stock, in his border, which is very dry due to several evergreens and hardy shrubs. Last time I visited I took a small rooted sample back to the West Midlands (UK); even though I don't actually have a garden, I have a number of pots around our doorsteps. It's doing quite nicely in a 4'' terracotta pot and hopefully will blossom next year..
On Mar 16, 2010, lehua_mc from Portland, OR (Zone 8b) wrote:
Absolutely a no-fail ground cover, which is to say treat it like a ground cover, not a garden plant. I started mine by seed indoors last spring (why not?), and set out a couple starts. They filled in a hot dry corner that summer in no time, and now a year later have disregarded an 8" gravel edge to start mingling with the grass. It stayed a lovely ever grayish pale green throughout the winter, and for that I've decided this is another great tool for all those hard to deal with areas where I need to keep the weeds to a minimum, can't put a "garden plant", but don't want grass.
On May 15, 2007, saladgirl from Las Vegas, NV (Zone 9a) wrote:
Las Vegas, NV
This plant does well in spite of our summer heat, providing it receives regular (daily in summer) watering and shade in the mid- and late-afternoon. Surprisingly, it has survived year after year.
We have had this plant covering a small hillside that nothing else would grow in, and it's proven to be the right plant for the job. During heavy winters (170" snow or more) it has a tendency to thin out, however, it's a prolific re-seeder, and bounces back quite nicely. There are two cultivers that I know of. The more aggresive variety has larger leaves (1 1/2") and has a 'looser', more relaxed look, and covers quickly. The other strain has 1" leaves, and grows slow and tight. This is a handy little plant, but it will need more water in dry, west side plantings verses east side plantings. We have much better luck with the larger leaf variety.
Upon moving into our recently renovated 1920's home in Oscoda MI, we needed to plant something that would grow without much fuss on the outside of our fence, between fence and sidewalk. We planted Snow-in-Summer & Russian Sage, alternating three SIS in downward "V" and three RS in upward "V". The result was AMAZING! Beautiful mounds of SNOW half the summer and sprays of lavender sage the other half. It was such a pleasant surprise the first year but when they all came back by themselves without much tending the second year and gave an even MORE spectacular show...well, we were thrilled! The only warning I would give new owners of SIS is to remove any leaves, etc. from atop the green as soon as the snow melts. The leaves will kill the plants quickly.
On Feb 4, 2005, MaryE from Baker City, OR (Zone 5b) wrote:
My single plant has grown to a mat of 25x35 inches, in full sun in a hot dry climate with regular watering. It might have done better if it had more shade since my sun is very intense. I'm thinking of moving it since I want to get another plant or two so I can put a small childs sled in the patch to make it look even more like snow in summer. When I get that set up I will take a picture and post it here.
On Nov 13, 2004, 433kfj from klamath falls, OR (Zone 6a) wrote:
I have a large mound of this growing under a pine tree on a slope in front of my house. It's a pretty shady location, but it blooms OK. The problem is that it isn't spreading out, but mounding up. Pine-needles are falling on it and making it like a big mulch pile. I thought I might trim it down lower but I'm afraid the roots might be growing higher in the mound and the original roots below have died out, as it seems to be pretty shallow rooted. This is an old house that I'm renting so I have no idea how long it has been growing there. I'm free to do most any thing I want with the landscape (or what little of it there is!). I'd like to keep it growing, but I think part of the pile might be an ant hill, as there are lots of red ants on this tree ( thank god we don't have fire ants or I'd be dead by now!)
On Aug 13, 2004, pokerboy from Canberra Australia (Zone 8b) wrote:
A tough plant, snow in summers gives a great low water grey carpet in cooler zones. Will not tolerate excessive heat or humidity. Its small single white flowers virtually cover the entire plant in summer resembling snow on the mat of foliage. Good border plant. Grow in full sun. pokerboy.
On Jun 9, 2004, WeedPuhler from Edmonton, Canada wrote:
An old perennial favorite, they are the silver-gray back drop to my Tiger and Asiatic lilies and bulbs. It comes back from slumber ready to bloom its head off... We found this groundcover in some neglected beds in our 30 year old garden, it seems that it likes our brutal Edmonton, Alberta (Canada) winters. I grow it on the edges of my raised planters and it tends to make its way to the centre, yet the shallow roots are easy to pull out, and everyone likes getting them! It approves of bone meal, transplants beautifully and is quite forgiving, as long as it has full sun. I mulch it with fresh peat moss in spring, and it makes them grow taller and softer.
This is an awesome plant for those who are not limited by space! Here in New Hampshire USA, I have never watered it, and it grows in both fertile and non-fertile soil! Here is a beautiful accidental combination I ended up with: In a hurry to plant the pieces of the plant that were given to me I quickly threw them into a bed in which I had planted some tulips in late fall. In the spring, I had these beautiful tall white lily flowering tulips above a dense carpet of white cerastium! Breathtaking! The foliage is great for a moon garden as it is silver and glows in the twilight! No care except occasional weeding as it does form a dense mat and even spreads into the lawn a bit which I love! You can mow right over it!
On Aug 8, 2001, killerdaisy from Dallas, TX (Zone 8a) wrote:
Snow-In-Summer is mat-forming, and is known for it's profuse blooming in late spring/early summer. Dainty, white flowers, with wooly, white leaves. Plants spread to about 24", making it the perfect groundcover. It does not tolerant heat nor humidity, and can become invasive in fertile soil. Divide in spring or fall, every two years.
This plant has been said to grow in the following regions:
, Mallorytown, Bear Creek, Alaska Sitka, Alaska Flagstaff, Arizona Clovis, California Fairfield, California Lake Wildwood, California Martinez, California Menifee, California San Jose, California Tiburon, California Waterbury, Connecticut Talleyville, Delaware Idaho Falls, Idaho Irwin, Idaho Rathdrum, Idaho Chadwick, Illinois Mount Prospect, Illinois Saint Charles, Illinois Galena, Indiana Louisville, Kentucky Westbrook, Maine Elkton, Maryland Chicopee, Massachusetts East Pepperell, Massachusetts Norton, Massachusetts Bellaire, Michigan Grand Haven, Michigan Fridley, Minnesota Montevideo, Minnesota Florence, Mississippi Marietta, Mississippi Marshfield, Missouri Fort Benton, Montana Las Vegas, Nevada Berlin, New Hampshire Epsom, New Hampshire , New York Baxter Estates, New York Cato, New York Jefferson, New York Cheviot, Ohio Columbus, Ohio Haviland, Ohio Midwest City, Oklahoma Baker City, Oregon Klamath Falls, Oregon Portland, Oregon East Norriton, Pennsylvania Jessup, Pennsylvania Lewisburg, Pennsylvania Milford, Pennsylvania Philadelphia, Pennsylvania Pittsburgh, Pennsylvania Clarksville, Tennessee Knoxville, Tennessee Lawrenceburg, Tennessee Unicoi, Tennessee Hereford, Texas Farmington, Utah Brewster, Washington Buckley, Washington Chimacum, Washington Millwood, Washington Moxee, Washington Poulsbo, Washington Delavan, Wisconsin Madison, Wisconsin