How to maintain/plant this sloping hillside? Ideas?

imahousenewbieMarch 30, 2011

We just moved into our first house. I'm excited, because I've always been in apartments and never gotten to garden before. I'm having lots of fun in the nice front yard planters!

What we can't figure out is what to do with this sloping hillside in our backyard above our pool. It appears to be all weed grass, and it grew insanely fast after a few days of rain. My husband went up there with a weedwhacker to keep it from getting too overgrown, but it took him a really long time, and it's already growing again. I really don't want to have to weedwhack it all the time, plus it gets crud into the pool.

We can't afford to terrace it or get a landscaper in here right now, with all the other fix-it costs of the house piling up, so that's not an option. It's pretty when it's all green up there, but once it grows up high, it just looks bad. I noticed up at the top of the hill, there's a small patch of pretty purple wildflowers. I'd LOVE to get something like that all over the hill! I bought a big packet of wildflower seeds to spread, though I'm wondering if that will cause issues. Will the wildflowers "take over" the weeds, or not? Do I have to kill the whole hillside first? And obviously once there's flowers up there, you can't weedwhack without killing the flowers too...any ideas on what to do with this hill? I'd like to either have it green or with flowers/color, with VERY little maintenance. Or maybe one day put some fruit trees up there. Suggestions? We're total newbies at all this, and need it low-budget. Is there maybe a green plant or flowering ground crawler you can recommend that "takes over" the hillside and doesn't need trimming, that looks good?

Oh, and we're in Southern California, if that helps.


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Boy that is a steep hill!
Your pool is right under it? Wow!
DOn't kill that grass what ever you do, til you immediately replant something else there!
You have to worry about erosion on that hill, for your pools sake.
The very best plants for erosion are grasses, (there are some gorgeous grasses youo can plant on that hill, that includes bamboo, sumac, but I think your zone may be too hot for sumac, day lillies, which are awesome and grow anywhere, no maintaneous,
I think I would look into daylillies, go to your local nursery in the spring and see what kind will do well for you where you live.
You can plant the daylilly in with the grass already there, just clear some soil, plant the daylilly and move on to the next one, the grass already there won't hurt the daylillies at all.(Since you like flowers).
Whatever you do, keep the grass there til you get a substitute or the hill will be in your pool.

    Bookmark   April 5, 2011 at 3:54PM
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alygal(PacNW z7)

A few ideas come to mind. Not sure what part of So. Cal you are in but these would be appropriate.

1. Some kind of ice plant.
2. Native CA plants (native to your area); CA poppies, lupines, etc. Ceanothus is a native shrub w/blue flowers.
3. Combination of daylillies, natives, ice plant.

You might want to go to a local nursery and see what they have to offer. What direction does your hillside face? Does it get morning or afternoon sun? That will factor into your decision on what to plant too. CA poppies can be grown easily by seed and they reseed like crazy.

Here is a link that might be useful:

    Bookmark   April 17, 2011 at 1:11AM
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nil13(z21 L.A., CA (Mt. Washington))

Almost all those wildflower type plants are annuals and only grow part of the year. I recommend that you dig out the slope right behind the retaining wall to give it a little freeboard. That is some space for runnoff to go before it overflows into the pool. The more the better but three inches would be a good start. I have had a lot of success with vetiver grass. It is a tropical grass from India that is not invasive. It can survive on just over 15 inches of rain per year once established. It also has an extensive root system to stop erosion and the crown can get buried and the plant just moves the crown up instead of rotting. Plant that right along the wall and then plant some big shrubs behind it like manzanitas or sages. Daylilies are pretty tough plants too.

    Bookmark   May 12, 2011 at 1:44AM
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Our place had apple mint growing in lots of wrong places, but it's turned out to be great left to colonize one of our steeper slopes. Of all the crazy things growing on our mountainside, I think I'd go with apple mint over all else if I needed a ground cover for a super-steep place. It will attract bees when it blooms, though, which you might not like around your pool.

    Bookmark   May 19, 2011 at 8:20AM
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vetivert8(NI-NZ zone 9a)

Those wildflowers at the top of the slope look like mallows of some kind, maybe Lavatera.

I like your palm tree. Looks like Trachycarpus. Very hardy and has flowers when it's taller. It also drops fronds, but not often.

What you put on your bank really depends on how much time you have to stay on top of the care needed for the first year or so until any plantings get established.

There have been some lovely suggestions offered already: the iceplant and the local Ceanothus. There are varieties that spread beautifully to smother. Otheres are taller and more bushy. They come in a small range of colours, mostly blues and purples and they can provide a succession of flowers over weeks.

I liked the idea of the California poppies. They are so tough! And there are colours other than the standard 'orange'. You might want to plant 'pools' of them among Ceanothus to give a fairly strong visual impact. A 'Pacific' colour scheme suitable for strong sunlight. Pastels tend to get a bit lost in hard light.

The iceplants can be very effective - big sheets of colour usually in 'hot' tones, although there are softer pinks available. And, for seriously tough sites - Gazania, Arctotis, Anigozanthis (kangaroo paw - which comes in a pleasant range of flower colours dark red to interesting green.) They're usually perennial.

Climbers and sprawlers - Bougainvillea, Campsis, Trachelospermum (which smells delightful). Instead of climbing a trellis they can sprawl down the bank, needing only a trimming with shears to stay civil. Bougainvillea has thorns, however. As do the carpet roses and Rosa 'Nozomi'.

That's a fairly steep slope so work across it rather than 'up/down' to reduce the risk of rain damage. Leave strips of grass to catch the run-off and protect your pool from mini-mudslides. At least until your plantings are spreading out.

Before planting ANYTHING - check with your local garden centre to see if it's safe for newbies. Some things look so innocent when you see them as a cute little cutting in a teeny pot... and then you find they have rule-the-world tendencies. English ivy would be one. Cortaderia would be another. Many South African bulbs, such as Watsonia, can happily fill acres. So can Ornithogalum. And, if it's not too hot where you are, asparagus fern and ginger plant can take over in no time.

If you should chance to like them - and don't mind some spiny-ness consider bromeliads. There are many hardy varieties that happily live outdoors, flower fairly regularly and make a good groundcover. And aren't fussy.

    Bookmark   May 30, 2011 at 5:37AM
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Suzi AKA DesertDance

Ice plant! It's lush, neat, and no weed whacking required, EXCEPT you may get weeds popping up between the plants...

The house across the street from my late mother-in-law had her corner hill covered with weedy ice plant. Once that succulent takes hold, it's really slippery to walk on just to whack or pull the weeds.

There's always landscape cloth with gravel and select plants, but I think you may need to terrace.

    Bookmark   August 8, 2012 at 11:53AM
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