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Small, resilient, but not invasive, plants to grow in between stepping stones? #873419

Asked June 17, 2024, 11:43 AM EDT

I have a 30' long bluestone flagstone pathway in part sun. I would like to plant something in between the flagstones now that they have been cleaned and I can see there is intact dirt between the pavers that will soon grow weeds (that I had to remove before cleaning!). The pathway is a gentle, well drained slope. We walk along the path several times a week. Our small dog walks along the path several times a day. I would like the plants to not die down in the winter and to be low maintenance.

Howard County Maryland

Expert Response

Cristina,  you don't mention the light conditions - sun, shade, etc.  This is important as there are many plants that would suit the site but need full sun.  Also, a picture or two would be very helpful.
Thanks!
Taffy Replied June 17, 2024, 3:47 PM EDT

 It gets about 4-6 hours of sun a day. Pictures are attached.

The Question Asker Replied June 18, 2024, 7:31 AM EDT
The selection challenge will be a plant that does not lose foliage for winter; most groundcovers, especially ground-hugging types, will go fully dormant and won't be evergreen. We can provide some suggestions, but it won't be an exhaustive list, and not many (at least among species best-suited to our mid-Atlantic climate and which aren't invasive) will thrive if directly walked-on often. Finding starter plants small enough to plant between the existing stone gaps might be challenging for some of the species below.
  • Partridgeberry (Mitchella repens) -- native; evergreen; fairly slow to spread; showy, small white flowers and red berries (we do not know if this will pose an edibility problem for the dog, so check with a vet since we don't have medical training regarding plant toxicity for pets)
  • Irish Moss (Sagina subulata) or Scotch Moss (the golden 'Aurea' cultivar of the same plant) -- evergreen; slow to spread; not a true moss, and can flower, though the tiny white blooms are not highly decorative
  • true mosses, which may just arrive on their own if the soil is compacted and damp enough; otherwise some companies do sell starter kits to "seed" (spread spores, really) moss into new areas
  • Violets (Viola, many species) -- many are native, but the non-natives tend to be non-invasive; at a few inches tall, they might be higher than you want, but several species are pretty tolerant of foot traffic abuse; Viola walteri 'Silver Gem' is not locally native (but the species is a U.S. native), but is becoming more readily available as a decorative groundcover
  • Woodland Stonecrop (Sedum ternatum) -- native; evergreen (though can turn pinkish); slow to spread; more fragile, in the sense that sprawling stems will break off if stepped on too much, but the pieces might root into gaps and survive as new plants
  • Grassy-leaved Sweet Flag (specifically the dwarf, golden-leaved cultivar Acorus gramineus ‘Minimus Aureus’ because it stays only a few inches high) -- fairly evergreen; yellow-striped foliage; creeping and grass-like (though perhaps clumpier) in appearance
  • Creeping Thyme (Thymus, several species) might get enough sun to do well, if the soil drains very well; aromatic foliage; not reliably evergreen, but can bloom
  • Dwarf Mondo Grass (Ophiopogon japonicus 'Nana') -- evergreen; slow to spread; grass-like appearance and does not need mowing; tufted at first, but will eventually fill-in to form more of a carpet, at least where stone gaps are large enough
  • Blue Star Creeper (Isotoma fluviatilis, also named Laurentia fluviatilis) -- might stay evergreen; faster growth than many of the above species; moderate foot traffic tolerance
Since you mentioned wanting to avoid invasive species, we wanted to mention (in case you weren't aware already) that the Yellow Archangel (Lamiastrum galeobdolon) we see growing near the base of the Hellebores is invasive, having spread into natural areas in a few counties in Maryland thus far. (To be fair, some of the older fertile cultivars of hybrid Hellebores spread by seed as well, but are not yet present in many MD counties, and are not universally considered to be invasive locally.)

Miri

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