Perhaps this is why moss gardens can be so sublimely meditative, something Japanese gardeners figured out a long time ago. Moss gardens here are rarer, and it takes effort and care to keep them looking good. Looking good for us, that is. Mosses don’t care to be ornamental (though they are). They just want to find their niche and grow and reproduce. This is why you find some in the cracks in the city sidewalk, on decaying logs in woodlands, on stone walls and amid failing lawns. It is this last aspect that has given them an unfair reputation as undesirable invaders. Maybe it’s the lawn that needs to go. But to value mosses in the landscape, it is essential to greet them at their level, through the lens of a botanist.
This is why I joined more than half a dozen other curious souls late last month at Benjamin Banneker Historical Park and Museum in Catonsville for a moss workshop given by Linda Davis and her husband, Charlie Davis, naturalists with the Natural History Society of Maryland. Charlie stayed indoors with seasoned moss devotees, seeking to identify species with dissecting tools and microscopes. Linda took five of us moss newbies outdoors, around an old house that functions as a meeting place, proving that you don’t have to go deep into the woods to find several species of moss. You need only find a leaking gutter or a dripping faucet.
On the porch, she told us that mosses are not like other plants; they have no interior plumbing that connects the leaves to the roots, and as nonvascular plants they share (and dominate) a plant niche called the bryophytes. The others are the hornworts and liverworts, not to be confused with Hogwarts and liverwurst.
“These guys are not sucking water,” she told us, “and yet their whole life history depends on water.”
Without xylem and phloem and with paper-thin leaves, mosses rely on direct contact with water to stay hydrated and nourished and to reproduce; male and female parts are separate, and the sperm — not pollen — needs water to swim to its target. The moss then produces a capsule-bearing stalk — a sporophyte — and the capsule contains spores, not seeds, which are so light and tiny that they can find their way to the jet stream and migrate around the globe. There are no roots, but they have anchoring structures called rhizoids, which can reach down a few inches. The leaves contain a natural antifreeze agent, and mosses are among the few ground-hugging plants that stay green through the winter. They have compounds that make them unpalatable to pests and diseases, and thus stay clean and uneaten. They trap water and pollutants, they control erosion, they grow where other plants fear to tread. Who could call such a plant a weed?
As I discovered, moss crisps up when it gets dry, but it can spring back in a moment when it is wet. And 2018 was surely the year of the moss, with record rainfall in Washington of 66.28 inches — more than the two previous years combined.
Linda Davis has noticed the resulting vigor of moss clumps and the abundance of the capsules, which have their own decorative quality. “I have seen a lot more sporophytes this year than ever,” she said.
After taking the class — the Davises hold it on the last Saturday of every month — I couldn’t walk anywhere without seeing mosses and noticing the differences in size, habit, colors and sporophytes between species.
Mosses are all around us, but what of their considered use in the garden? I have a few thoughts: Start small and find ground that undulates; moss is so low-growing that it can look less interesting on a flat area. As with any other garden plant, context is everything, and your moss patch should be framed in some fashion and planted with other sympathetic flora for textural contrast. But it must be in scale; asarums, foamflowers, snowdrops, ferns, mondo grass, creeping phlox, sedges and even dwarf azaleas would make good partners.
Surprisingly, perhaps, moss gardens are not without maintenance needs. (No worthy gardens are.) Patches must be kept free of leaf litter and other debris and must be weeded. One imagines a Buddhist monk on his hands and knees with a hand brush and tweezers, which, come to think of it, would beat a lot of other domestic chores.
I asked moss expert Annie Martin what would be the watering regimen if moss were to remain green and handsome in a non-monsoon year. Three times a day, she said, but for no more than three minutes a spraying. “If you can only do it once, choose late afternoon,” she said. Even that seems onerous, but as she said, “it’s way less water than people use for lawns.”
We think of mosses growing in shade gardens on acidic soil — some mosses take deep shade and are perfect for areas where little else wants to grow — but some species will grow in full sun and others on limey soil. The key is to find the right one.
In her 2015 book, “The Magical World of Moss Gardening,” Martin lists a range of species for garden use. Her favorite is the tree moss, Climacium americanum, which likes soggy places but can take sunny sites (with moisture) as it journeys through shades of green. “It has marvelously fluffy texture,” she said.
She said another good garden moss, especially in shade, is the fern moss Thuidium delicatulum, which is a spreading side grower and shifts in color after leaf drop from emerald green to golden yellow.
Much of the moss used commercially in such applications as floral decorations is harvested from national forests by the truckload, said Linda Davis. It may be legal, but Davis wonders about the ecological harm of such harvesting. “I don’t encourage people to buy mats of mosses unless it has been cultivated,” she said.
This is what Martin does from her nursery and landscape design business, Mountain Moss, in Brevard., N.C. She sells mosses by the tray and ships nationally. Many of her mosses, she said, come as rescues from sites that are about to be disturbed by construction, or homeowners who want a mossless yard or are about to replace a roof. (Roof-dwelling mosses tend to be good for sunnier locations.)
“There’s no need to steal from the forest when there’s so much getting destroyed around me,” she said.
Without roots, mosses move easily and are able to regenerate from fragments. Thus, another option is to harvest moss from one part of your property to place it where you want it. Pieces can be raked out of a lawn, for example.
With watering, weeding and debris removal, plugs or fragments will come together if the conditions are right for that species. Just a few square feet of moss, strategically placed where you can see and enjoy it, will provide a Zen-like feature in any garden, large or small.
“Mosses touch our spirit in a special way,” Martin said. “They are plants that are 450 million years old and saw the dinosaurs come and go, and all those upstart plants come and go. We need to take advantage of our mosses rather than get rid of them.”
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