Groundcover as substitute for moss

Almost every Japanese garden in Kyoto hosts one part, which is covered in nice fluffy moss.
When building a Japanese garden outside of Japan or even in another area in Japan, there might be some problems when it comes to establish moss in it.

Saiho-ji or Koke-dera. The moss garden in Kyoto.

Saiho-ji or Koke-dera. The moss garden in Kyoto.

Although moss doesn’t need much to grow, there can be too much. Too many nutrients in the soil will enable other plants to overgrow moss. If we don’t have enough humidity, it can be hard to grow nice varieties of moss as well.
If we have too much sun, only yellow appearing mosses grow nicely.

Maybe we try once or twice to establish moss nonetheless, but when the moss still doesn’t grow, we might think of an alternative to moss.

Today I want to introduce some plants we can use for this purpose.

Design by Green Farm Haji in Hiroshima

Design by Green Farm Haji in Hiroshima

Mondo grass for shade
Ophiopogon japonicus

This plant is an asparagaceae and a relative of Aspidistra.
Especially in Tokyo and more northern parts of Japan it is often used as a substitute for moss.
Its leaves have a dark green colour and over some years it forms a dark green carpet.
Light: It can also grow in the sun, but it will look better in partial shade and shade.
Soil: It likes humous, slightly acid soil.
Water: Mondo grass shouldn’t kept too wet. It is quite easy to handle.
USDA: 7-10

International Garden Show in Hamburg / Germany 2013

International Garden Show in Hamburg / Germany 2013

Sedum for sun
Sedum var.

The most beautiful substitute for moss I’ve ever seen, I found at the international gardening show in Hamburg in 2013.
A company tried to build a small Japanese garden there and used some mixed varieties of Sedum to gain the effect of a moss-covered hill. It looks like Sugigoke in summer.
This mixing is only good for some months though, because the stronger varieties of Sedum will overgrow the weaker ones.
One needs to try which ones are working best in the own garden.
Light: Sedum likes a sunny place.
Soil: Not too humous, it likes well drained and sandy soil.
Water: Don’t give too much water or Sedum will rot. This is a plant for dry places!
USDA: 4-9 (for Sedum spurium)

Privatgarten von Günter Heymans

Private garden by Günter Heymans

Heath Pearlwort or Irish Moss for partial shade
Sagina subulata

I’ve seen pictures of one rock garden using Sagina in-between.
Since then it is my dream to once use it as a ground cover as well.
I think the garden looks gorgeous and it makes a nice substitute for a lighter moss variety.
Sagina is sold in Japan as well, so maybe my dream will become true?
Light: Sagina can be planted in sun or partial shade.
Soil: Not very demanding, normal soil or sandy soil.
Water: Don’t keep it too dry. Water regularly in dry periods.
USDA: 3-9

A modern grass / rock design by Smart Design Studio in NSW Australia

A modern grass / rock design by Smart Design Studio in NSW Australia

Zoysia grass / Manila grass for sun to shade
Zoysia japonica (colder areas) / Z. matrella (warmer areas)

In Japan a very drought resistant grass is used, which can deal with the extremely dry and hot summers.
This grass also makes a good substitute for moss, because it is quite slow growing.
Two varieties are used often: Z. japonica for colder and more exposed areas and Z. matrella for warmer and shady areas.
Zoysia becomes yellow in winter.
Light: Z. japonica likes sunny or partial shaded spaces while Z. matrella also tolerates shade.
Soil: Needs well-drained soil. Around pH 7.0 is best.
Water: Doesn’t need too much water. For staying green in hot, dry summers, a regular water supply is necessary.
USDA: 5-10

A modern garden path with bricks and Phyla. By Slow Garden in Hamamatsu.

A modern garden path with bricks and Phyla.
By Slow Garden in Hamamatsu.

Hairy Frogfruit for sun to partial shade (not recommended for Australia!)
Phyla (Lippia) canescens

This groundcover is really nice, especially when the plant is in bloom. This gives a special touch to every garden and can function as a surprise in a Japanese garden!
However, there is one negative point about this plant. It may not be green in winter and loose all its leaves.
Maybe the perfect substitute for a summerhouse outside of the city.
Phyla is an invasive weed in Australia, but it doesn’t make problems in most other countries.
Light: Sun is better, but it will also grow in partial shade.
Soil: No special soil needed. But well drained soil would be better.
Water: It doesn’t need as much water as lawn. If it rains regularly, giving extra water is not needed.
USDA: 8-11

These plants are only a few possible substitutes for moss. I hope I will be able to publish a more detailed eBook some day!

If you are interested in what varieties of moss are used in a Japanese garden and how to establish moss in your own one, have a look on our eBook about Moss in the Japanese garden.


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11 responses to “Groundcover as substitute for moss

  1. I use Mitella × inamii, which is a woodland native of mountains of Fukuoka on the island of Kyushu. It is low growing and spreading in deep shade.

    • That’s a good question 😅
      If the conditions are good, it will make a good substitute in sunny places.
      However, my experience is, that thyme really creeps to the places it likes and becomes bold in the other areas.
      Which isn’t quite appealing.

      • I’m in East Anglia, UK – has less than half the rainfall of west UK – and planning a Japanese inspired garden for my new house (the move has, sadly, been postponed – I’d hoped to be in by now!). In one sunny area I was intending to attempt a chequerboard design as at Tokofu-ji (I’ve not visited, just looking in books) and was thinking of Thyme for that … could also use some creeping Sedum I guess. Any other suggestions? Soil is clayish, haven’t pH tested yet but likely neutral-alkaline. [Also looking for trees to buy to create instant shade for a tea-garden type area … Acer palmatum hard to get at that size without great expense … Betula e.g. ermanii OK but possibly too big ultimately … Liquidambar? Euonymus europeus? Amelanchier? Sorbus? I’ve seen you mention pruning Zelkova, which would otherwise get too big – any additional info on that?]

      • Sounds amazing what you are planning! Would you mind sharing pictures when you’re able to start working on it?
        I used creeping thyme on a border and found, that it loved to creep over the tiles. In one season it covered 10-20 cm of the tile approach.
        However, looking at pictures found in the web, thyme can make a great groundcover for soil.
        I guess it is just a bunch of work to keep it shaped.
        This year I tried Sagina on my very sunny balcony and it grew great. I used the yellow variety, but there is also a dark green one available.
        Another option might be Acaena.

        For your tea garden you will need evergreens like Camellia as base and great foliage trees as some accents.
        Often there are really huge trees (2-3) covering the whole area with their leaves, and smaller trees beneath.
        As substitute for Acer, but to get the same “feeling” – small leaves – have you thought of Crataegus?
        Another option could be Acer buergerianum.

        I am sorry, my time for RJG is quite limited. These suggestions are all I can give at the moment without further research..

  2. Thank you! I have two different Acaena in my current garden which are lovely (and quite invasive! I think it would cover the tiles more than Thyme at the rate it goes here). I have literally 100s of things potted up from my existing place (I’m a plantaholic!) and have been splitting many lower groundcover plants e.g. Ophiopogon (5 types), Pulmonaria (5 types), Brunnera, Pachysandra, Asarum europeum – have 30-50 of many things now. Camellias don’t do well on the neutral-to-alkaline clay so either need potting or careful soil preparation and aftercare 😦 and yes I forgot to list Hawthorn, very much a feature of the countryside here.

    I’m making a strategy decision to use Japanese approaches rather than complying 100% with authenticity – for example the ‘tea garden’ needs to fulfil the same purpose of changing one’s mindset from worldly matters to a calmer and more ‘present’ state, and the planting will be accordingly ‘quiet’ … but a) it’s practically also a main route for me to the stables and my horse, so stepping stones are not practical (although can be suggested within the paving design and still used if one chooses), and b) it won’t be used for tea ceremonies/I am a coffee drinker so the venue of destination won’t be such a closed space. Photos of the location as it is here https://www.flickr.com/photos/vickimartin/albums (two incorporating ‘The Willows’ which is the name of the place – there are also albums from three non-Asian Japanese/Chinese gardens (Lan Su in Portland, Tea Gardens in San Fran, Purelands in UK – latter gives me some ideas but is also a bit of a pastiche/gimmicky I think?). As you can see, I inherit an existing koi pond – and that *will* have stepping stones to the seating area.

    • Thank you so much for sharing the pictures! The estate looks great!
      It is always fascinating how plants act differently in other places of the world. I have experience with Acaena in northern Germany and with creeping thyme in Tokyo.

      I think I have seen a picture of an approach to a “western style” tea garden, which might be of interest to you.
      However, since I saw that picture it has been some years and I don’t know if I am able to find it again.
      I think it was established in Europe or the USA and was not using traditional Japanese plants but local ones.
      It was a really nice Roji.

      • I’ll have a hunt for that garden – thanks. If you remember any more info please re-post!!!

    • Lichen or algae maybe..
      I am sorry, but at the moment I don’t know of any plants which can grow and can be shaped like this..
      There are plants though, which are growing great on walls (like Ficus pumila, if you have the conditions), but they can’t be put on like moss graffiti.

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