Covering the ground

Sunday, 25 September 2016

A very weedy spot in my garden!

Weeds, weeds, weeds! Was there ever a spring with so many weeds? The recent rains have seen them proliferate madly. My garden is awash with them, and no sooner do I pull them out than more appear. They say that Nature abhors a vacuum - and it seems she hates a bare patch of soil too. Whilst I have many bales of cane mulch ready to spread, this task hasn't been done yet as I have been spreading all my bags of cow manure first - a spring ritual to keep my soil in good health.

Some plants will also receive a blanket of homemade compost - mainly my Hydrangea and Camellia shrubs, and plants growing in beds where the soil is not as good as elsewhere in the garden. However, spreading the cane mulch will be a vital step in my fight against the weeds. This form of mulch lasts a long time, helps retain moisture in the soil, and stops many weeds from growing. Eventually it breaks down and adds to the organic content of the soil. I spread it more lightly in areas where I hope for self-seedlings to appear, or wait till these come through before applying the mulch.

Violets make a robust groundcover in sun or part-shade, with dainty flowers in late winter and early spring

In some areas of my garden, however, the planting is so dense that there is no room to put mulch down. These borders have an underplanting of low groundcovers that run between shrubs and clump-forming perennials, and weeds are far fewer in these areas. I love the look of the tapestry of such groundcover plants and want to grow more of these in my garden to help with my weed problems! These plants are especially useful in slightly 'wild', out-of-the way spots in the garden where you'd like to have a swathe of greenery without having to constantly weed, but where grass won't grow and a vast blanket of cane mulch could look rather dull.

When planting out groundcovers, it is important to start out with a weed-free soil - as far as humanly possible, that is! Enrich the soil with compost and give your groundcover a good start in life by watering it in well with a seaweed extract solution. Keep it well watered until it is established. It is useful to provide a surface mulch of compost to cover the surrounding soil whilst the groundcover is establishing, in order to avoid more weeds emerging in the meantime. This sort of mulch will break down by the time the groundcover gets going. By their very nature, most groundcovers are fairly vigorous plants and will make a decent-sized carpet. More and more in my garden I want bigger groups of a smaller variety of plants, to give more impact than the dizzying melange of many different individual specimens that was once my style.

Lamium maculatum White Nancy

Generally speaking, I choose groundcovers that have interesting foliage and, if possible, the added bonus of flowers. Some of my favourites are coming into bloom now. Lamium maculatum is a beautiful groundcover for shaded spots, as long as there is some moisture in the soil. It has stunning leaves marked with silver - in some cultivars there is only a tiny margin of green on the foliage. Lamium has pink, white or purple hooded flowers in spring, when the foliage seems truly at its best. It makes a wide mat when it is happy. It is best to avoid yellow-flowered Lamium galeobdolon 'Variegatum', which can be quite invasive, unless it is for a truly wild part of the garden!

Saxifraga stolonifera

Another good groundcover for shade is Saxifraga stolonifera, which has silvery-veined rounded leaves and a froth of tiny white blooms in mid-spring. It spreads stealthily via its stolens, but is easily pulled away from areas where you don't want it. I enjoy growing this in and around hybrid hellebores. The species geranium Geranium macrorrhizum is also a shade-dweller, growing into a wide mat of rounded green foliage with a felt-like texture. In spring and early summer, gorgeous flowers of pink, purple or white float above the leaves like dainty butterflies. It is one of the best species geraniums for the Sydney climate.

Rhizomatous Begonia Silver Jewel

Rhizomatous Begonia include some of my favourite groundcovers for shade. There are so many cultivars of these amiable plants, with leaf colours ranging from silver to near black, and a mindboggling diversity of patterns. All the rhizomatous Begonia bloom in spring, with clouds of pink or white rounded flowers. Growing a few different varieties together as a carpet below shrubs can make an effective, low-maintenance garden area. In the Begonia Gardens at the Royal Botanic Garden in Sydney, there is a wonderful demonstration of how these plants can be used as a groundcover around taller plants.

Pretty foliage of Campanula poscharskyana

For areas with a bit more sun in the garden, Campanula poscharskyana is a good choice of groundcover, with ruffled, heart-shaped leaves and blue, white or (rarely) pale pink bell-shaped flowers in October and November. Sweet violets (Viola odorata) grown en masse can make an excellent weed-suppressing rug. It is fun to grow pink-, white- and purple-flowered forms together. Violets can stand quite sunny positions. Herbs such as thyme and golden oregano can be useful groundcovers in hot, dry spots in the garden, as can Gazania, Arctotis and Convolvulus sabatius.

Sedum mexicanum Gold Mound with annual Lobelia

Sedum mexicanum 'Gold Mound' is one of my top favourite groundcovers. Its multitude of tiny sprigs of fleshy gold leaves can cover a good amount of soil over time, and at this time of year, it really glows! Grown in shade, where it does just as well, the foliage takes on a limey hue. I love to have it growing around orange Clivia for a real colour pop. I like it with yellow flowers such as Bulbine frutescens (in bloom now) and I also adore it with rich blue flowers, such as the annual Lobelia, illustrated above. The Sedum will have bright yellow blooms itself in mid-spring.

Massed bromeliads can make a great groundcover, as seen in the garden of Sandra Wilson in Sydney

All of these I have mentioned are ground-hugging specimens, but taller, vigorous clump-forming or spreading plants such as Clivia, bromeliads, Japanese windflowers, Plectranthus 'Nico', Pilea cadierei, star jasmine (Trachelospermum jasminoides) and Liriope - and even prostrate-growing shrubs - can also play a role in covering the ground, and helping to avoid the dreaded task of weeding.

I will be having a short break from blogging for a week or so. Enjoy your spring garden, and also maybe consider visiting one of the many gardens open to the public over the next few months. See here for more information on these.

Reader Comments

  • By Janna 0 Monday, 26 September 2016

    Oh, how jealous I am of the plants you can grow! I adore that Saxifraga stolonifera. Why is it we always want what we can"t have?! Enjoy your break. Hi Janna, how lovely to hear from you. I would like all to be able to grow all those beautiful plants in the English gardens you have been visiting! Deirdre

  • By Carole 2264 Monday, 26 September 2016

    ...I"ve not much of shaded spots but the Golden Sedum is a winner here. You"ve encouraged me to think of it as a two-fold plant now to work with all the filling in and help avoid quite so many of the perpetual weeds. Thanks Deirdre I love that plant! Deirdre

  • By jil 3937 Monday, 26 September 2016

    So pretty Deirdre, all those ground covers and so much nicer than oxalis which I recently learned is grown deliberately as a ground cover in some parts of the world! Some years ago we transplanted a handful of violets from my parents garden into ours, they"ve spread to a thick and enormous carpet, so fragrant. Have a lovely break. Jil Lovely to hear from you. I love the sound of that carpet of violets. So nice to have plants handed on from other gardens. Deirdre

  • By Helen 7256 Monday, 26 September 2016

    Jil just mentioned the dreaded O word. I have an old garden which was neglected for many years & some sections have dense carpets of oxalis! I am nibbling away at it and giving it a bit of competition with vigorous native groundcovers eg mint bush, Grevillea. The areas are too large for the recommended procedures of removing all soil & sifting out all the little bulbs. Any oxalis material removed is burnt on site. Violets and Japanese anemones are great standbys in my cooler area too. I too have patches of oxalis plus a number of other nasties. I just try to get them out as best I can when they are small. I do think having other plants as competition for the weeds does help to fight them. Deirdre

  • By Trish 3128 Monday, 26 September 2016

    I am enjoying my Spring garden. I live in Melbourne and this year for the first time my "Green Wall" is in flower. I have been growing it for just over 2 years and it basically Pandorea pandorana "Ruby Belle" growing on wire mesh. I have added a picture - I am not sure whether it will work in a blog -fingers crossed here Hi Trish, I have adjusted the link so we can see the photo. It looks fab. Such a good idea. Deirdre

  • By Bren 2540 Tuesday, 27 September 2016

    Yes, I am always looking for new and effective ground covers. I have a large garden that has too much wandering jew and oxalis to be dealt with in the usual ways. I love the different Plectranthus species. I also bought a heavy duty ground cover "Ficus tikoua" from the Sydney botanic gardens. They have it on display in the ground cover section of the gardens near the conservatorium. It"s looking promising! Yes we do need those sort of robust groundcovers for parts of the garden. I will look out for that one! Deirdre

  • By margaret 2122 Wednesday, 28 September 2016

    Yes, I have never seen so many weeds in the garden, some of which are unfamiliar to me. My garden is basically weed-free, but the grass in the back, has been overrun with weeds. In my garden beds, I employ intensive planting, partly because I have a small garden, and partly because I like so many plants. This idea, with mulch, does help to keep the weeds at bay Lamium, saxifraga, rhizome begonias and sedum "gold mound" are most useful. Thanks, Margaret. The intensive planting certainly does help control the weeds. Deirdre

  • By Bren 2540 Thursday, 29 September 2016

    Actually, in reference to my previous comment, I have reclassified wandering jew as a groundcover rather than a weed in parts of my garden. IT is lush, green and uniform, and looks better than a mixture of different weed grasses etc in the wooded area of the garden. (This is the all year round wandering jew mind you; not the narrow leafed, blue flowered,prolific-in-summer wandering jew that I absolutely loathe). Periwinkle is another one that to some is a weed but to others is a groundcover. There is certainly a place for so-called weeds in difficult places in the garden. I grow the silver striped wandering jew called "Zebrina" as a groundcover - it is just as enthusiastic as the green one and looks fab in dry shaded places! Deirdre

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