Groundcovers for Sun

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Variety of thymes creating a multicolored groundcover.

Looking for a groundcover for a sunny spot? Maybe because the lawn isn’t holding up well or because it’s on a slope or is otherwise hard to mow… or simply because you really don’t want to mow anymore? Here is a list of plants you might find suitable:

  1. ‘Angelina’ Sedum (Sedum rupestre ‘Angelina’), zone 3, FTR: none
  2. Barren strawberry (Waldsteinia spp.), zone 4, FTR: poor
  3. Barrenwort (Epimedium x rubrum), zone 3, FTR: none
  4. Basket-of-gold (Aurinia saxatilis, syn. Alyssum saxtile), zone 3, FTR: none
  5. Bearberry (Arctostaphylos uva-ursi), zone 2, FTR: moderate20170426WEN.jpg
  6. Bearberry cotoneaster (Cotoneaster dammeri), zone 5b, FTR: none
  7. Bergenia (Bergenia crassifolia, syn. B. cordifolia), zone 2, FTR: none
  8. Bigroot geranium (Geranium macrorrhizum), zone 3, FTR: none
  9. Bird’s foot trefoil (Lotus corniculatus ‘Pleniflorus’, syn. ‘Plenus’, zone 3, FTR: good
  10. Bishop’s weed (Aegopodium podagraria ‘Variegatum’), zone 3, FTR: poor
  11. Black mondo grass (Ophiopogon plansicapus ‘Nigrescens’), zone 7, FTR: none

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    Bleeding-heart (Dicentra formosa). Photo: J Brew, Flickr

  12. Bleeding-heart (Dicentra formosa and D. eximia), zone 3, FTR: none
  13. Brass buttons (Leptinella squalida ‘Platt’s Black’), zone 4, FTR: good
  14. Bugleweed (Ajuga reptans), zone 3, FTR: moderate
  15. Cambridge geranium (Geranium x cantabrigiense), zone 3, FTR: none
  16. Caucasian Sedum (Sedum spurium), zone 3, FTR: none
  17. Creeping juniper (Juniperus horizontalis), zone 2, FTR: poor
  18. Creeping speedwell (Veronica repens), zone 2, FTR: moderate
  19. Creeping thyme (Thymus serpyllum), zone 3, FTR: moderate
  20. Crested iris (Iris cristata), zone 3, FTR: none
  21. Crownvetch (Coronilla varia), zone 4, FTR: none
  22. Cutleaf stephanandra (Stephanandra incisa ‘Crispa’), zone 3b, FTR: none
  23. Dwarf knotweed (Persicaria affinis, syn. Polygonum affine), zone 3, FTR: moderate

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    Faassen’s catnip (Nepeta faassenii). Photo: Wouter Hagens, Wikimedia Commons

  24. Faassen’s catnip (Nepeta x faassenii), zone 3, FTR: none
  25. Foamflower (Tiarella cordifolia), zone 3, FTR: none
  26. Goldenstar (Chrysogonum virginianum), zone 4, FTR: poor
  27. Green carpet (Herniaria glabra), zone 4, FTR: good
  28. Hairy greenweed (Genista pilosa), zone 5, FTR: poor
  29. Heuchera (Heuchera cvs), zone 3, FTR: none
  30. Hosta (Hosta cvs), zone 3, FTR: none
  31. Houseleek (Sempervivum spp.), zone 3, FTR: none
  32. Iceplant (Delosperma cooperi), zone 5b, FTR: poor
  33. Ivy (Hedera helix and others), zone varies according to species and cultivar: 4-9, FTR: poor

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    Kamchatka sedum (Sedum kamtschaticum ‘Weihenstephaner Gold’). Photo Maja Dumas, Wikimedia Commons

  34. Kamchatka sedum (Sedum kamtschaticum), zone 3, FTR: none
  35. Labrador violet (Viola riviniana ‘Purpurea’, syn. V. labradorica), zone 4, FTR: none
  36. Lady’s mantle (Alchemilla mollis), zone 3, FTR: none
  37. Lamb’s-ears (Stachys byzantina ‘Silver Carpet’), zone 3, FTR: none
  38. Lily-of-the-valley (Convallaria majalis), zone 3, FTR: none
  39. Liriope (Liriope muscari), zone 6 ou 7, FTR: none

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    Golden moneywort (Lysimachia nummularia ‘Aurea’). Photo: European Environment Agency

  40. Moneywort (Lysimachia nummularia), zone 3, FTR: moderate
  41. Moss phlox (Phlox subulata), zone 2, FTR: none
  42. New Zealand burr (Acaena microphylla), zone 4b, FTR: poor
  43. Oregano (Origanum vulgare), zone 4, FTR: none
  44. Ornamental strawberry (Fragaria x rosea), zone 3, FTR: moderate
  45. Pachysandra (Pachysandra terminalis), zone 4, FTR: none
  46. Perennial dusty miller (Artemisia stelleriana ‘Boughton Silver’, syn. ‘Silver Brocade’), zone 3, FTR: none
  47. Periwinkle (Vinca minor), zone 2b, FTR: moderate
  48. Rozanne™ geranium (Geranium ‘Gerwat’), zone 4, FTR: none
  49. Scotch moss (Sagina subulata glabrata ‘Aurea’), zone 3, FTR: moderate
  50. Self-heal (Prunella grandiflora), zone 4, FTR: none
  51. Sensitive fern (Onoclea sensibilis), zone 3, FTR: none

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    Siberian cypress (Microbiota decussata) forms a dense, weed-resistant groundcover. Photo: Crusier, Wikimedia Commons

  52. Siberian cypress (Microbiota decussata), zone 3, FTR: none
  53. Snow-in-summer (Cerastium tomentosum), zone 2, FTR: poor
  54. Spotted dead-nettle (Lamium maculatum), zone 2, FTR: none
  55. St. John’s wort (Hypericum calycinum), zone 6, FTR: none
  56. Sweet woodruff (Galium odoratum), zone 3, FTR: none
  57. Sweetfern (Comptonia peregrina), zone 2, FTR: none
  58. White clover (Trifolium repens), zone 3, FTR: moderate
  59. Wintercreeper (Euonymus fortunei), zone 5b, FTR: moderate

    20170426H Ghislain118 (AD), www.fleurs-des-montagnes.net

    Woolly thyme (Thymus pseudolanuginosus) Ghislain118 (AD), http://www.fleurs-des-montagnes.net

  60. Woolly thyme (Thymus pseudolanuginosus), zone 3, FTR: moderate
  61. Yellow archangel (Lamium galeobdolon), zone 2, FTR: none

Keeping Them Under Control

Most groundcover plants are a bit to very invasive… and that’s normal, considering that we choose groundcovers specifically for their ability to cover ground. It does, however, mean that you should always plan on how you eventually intend to slow them down when they’ve filled up their allotted space and start looking for new territory. You could, for example, contain them with a walkway, paving stones, a short wall, logs, lawn edging or deep shade.

Groundcovers for Shade

If you are looking for suggestions of shade-tolerant groundcovers, see the article Groundcovers for Shade.20170426A

Common Herbs With Weedy Ways

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Don’t let weedy herbs run amok in your garden! Illustration: confessionsofacomposter .blogspot.com

Who doesn’t enjoy fresh herbs, those aromatic plants that add such punch to our meals? Or treat our sniffles or upset stomaches? And they’re never fresher than when we grow them ourselves. That’s why herbs are presently so popular: everyone wants to try them. And most people find them easy to grow… at first. But many herbs have a major downside: they’re moderately to highly invasive and can quickly switch from being useful plants to becoming out-and-out garden thugs.

Two Categories of Weedy Herbs

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Borage is an easy-to-grow annual herb… perhaps too easy to grow, as it can self-sow so abundantly that it becomes a weed. Photo: Wikimedia Commons

There are two categories of potentially weedy herbs: those that produce creeping rhizomes or stolons (or sprout from broken pieces of root) that head off in all directions, soon producing offsets that surround and overwhelm neighboring plants, and those whose invasive habits are due to self-sowing, giving hordes of babies from the seeds they drop, hordes that can quickly threaten your entire herb garden.

Here is a list of the “main culprits” along with their preferred mode of invasion:

  1. Borage (Borago officinalis): seeds
  2. Caraway (Carum carvi): seeds
  3. Catnip (Nepeta cataria): seeds
  4. Chamomile (Matricaria recutita): seeds
  5. Chervil (Cerefolium anthriscus): seeds
  6. Chives (Allium schoenoprasum): seeds

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    Perilla or shish is a popular Chinese herb, but self-sows like the dickens. Photo: User:SB_Johnny, Wikimedia Commons

  7. Comfrey (Symphytum officinale): seeds and root sections
  8. Coriander or cilantro (Coriandrum sativum): seeds
  9. Costmary (Tanacetum balsamita): seeds
  10. Dill (Anethum graveolens): seeds
  11. Fennel (Foeniculum vulgare): seeds
  12. Feverfew (Tanacetum parthenium): seeds
  13. Garlic chives (Allium tuberosum): seeds
  14. Horseradish (Armoracia rusticana): root sections
  15. Lemon balm (Melissa officinalis): seeds
  16. Mint (Mentha spp.): stolons and creeping stems
  17. Monarde (Monarda didyma): rhizomes
  18. Mustard (Brassica nigra and B. juncea): seeds
  19. Origan (Origanum vulgare): seeds

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    Russian tarragon (Artemisia dracunculoides) can become a garden weed. Photo: Cillas, Wikimedia Commons

  20. Russian tarragon (Artemisia dracunculus): rhizomes and seeds
  21. Shisho or perilla (Perilla frutescens): seeds
  22. Sweet cicely (Myrrhis odorata): seeds
  23. Sweet woodruff (Galium odoratum): rhizomes
  24. Tansy (Tanacetum vulgare): rhizomes and seeds
  25. Thyme (Thymus vulgaris): seeds
  26. Valerian (Valeriana officinalis): seeds

How to Control Weedy Herbs

Weedy or not, several of the herbs presented above are essential to any herb garden. Can you even imagine cooking without thyme, oregano or chives? But fortunately there are ways to grow weedy herbs while limiting their ability to invade. Here are a few:

A. Self-Sowing Herbs

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Harvesting early and often prevents the plant from going to seed. Photo: Veganbaking.net, Wikimedia Commons.

  • Either remove all their flowers or harvest them before any seeds ripen;
  • Apply 3 to 4 inches (7 to 10 cm) of your choice of organic mulch (shredded leaves, wood chips, forestry mulch, etc.) throughout the herb garden, completely covering the soil. Seeds will not germinate in mulch-covered soil;
  • Hand pull when plants are still small;
  • Grow them beyond their hardiness zone. For example, fennel is hardy from zone 6 to 9 and can be weedy there if you let it go to seed. However, it won’t be invasive in zones 1 to 5.

B. Herbs With Wandering Rhizomes and Stolons

  • Cultivate them in pots on a deck, patio or balcony: that will nip any spread in the bud;

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    Peppermint (Mentha piperita) grow inside a barrier made of sunken pots.

  • Plant them inside a barrier sunk into the ground. This could simply be a plastic pot or pail with its bottom removed. The barrier should stick up at least 2 inches (5 cm) above the ground as the rhizomes of some plants, such as mint, right will creep right over a barrier that is level with the ground.

 


Don’t hesitate to grow herbs: most are great and very productive plants and you’ll be thrilled with the results. But do take note of the invasive ones. After all, forewarned is forearmed!20170425G confessionsofocomposter.blogspot.com