92905
Australia's largest renovations forum

Get the best landscaping and save up to 40%

Go

Retaining wall built as raised garden bed

Results 1 to 12 of 12
  1. #1
    Member
    Join Date
    May 2008
    Location
    melb
    Posts
    65

    Default Retaining wall built as raised garden bed

    Hi everyone,

    I've been looking into landscaping my back yard. I really like the idea of those retaining walls at the back fence to give the garden different height and dimensions. I've read through the retaining wall section of the forum and found out that its not a good idea to build a retaining wall again your fence as the fence isnt strong enough to hold the dirt. Therefore I've decided to build a raised garden bed right next to the fence line so it 'looks' like a retaining wall. Does that sound like a good idea?

    I want the raised garden bed to be about 0.6m high x 2m wide x 10m long. I am planning on building it out of treated pine, and then putting blueboard on and rendering it. Iwant it to look like something like this:

    I just need to ask a few questions:
    1. Do I need to think about drainage for this? I was told by a friend that I dont need draining as the water will just flow to the earth. But I wanted to make sure.
    2. What materials do you suggest I use in terms of what size timber to buy for post and sleeps?
    3. Would I need to put any waterproof sheets on the inside of the wall?
    4. Would it raised garden bed be strong enough to hold the soil
    5. Is there anything else that I should be aware of before I construct it?

    Any help would be greatly appreciated! Thank you thank you!!

  2. #2
    Member
    Join Date
    May 2008
    Location
    melb
    Posts
    65

    Default

    Anyone?!
    Someone?!

    I really need some advice and guidance.
    Thanks

  3. #3
    2K Club Member
    Join Date
    Nov 2009
    Location
    Geelong
    Posts
    2,443

    Default

    Well it depends on how long you want it to last and whether you are going to be eating what you plant. You want to avoid CCA treated pine for edible gardens IMO.
    If it is going to be permanent I would use concrete block, at least 3 course high on all sides.
    I have put short walls against fences ( 2 * 200mm redgum ) and filled the gap between the walls with gravel, the post was on the inside, I took the extra weight with star pickets.

    Personally I like the rustic look of weathered redgum, but it has a short life around 20 years.

    I don't think you would need extra drainage if you prepared the base properly by digging down first and maybe adding some coarse bluestone it depends on the soil profile where your raised bed is going to be

  4. #4
    Member
    Join Date
    May 2008
    Location
    melb
    Posts
    65

    Default

    Thanks moondog for your advice.
    I wont be growing any vegetables in the raised garden bed, I will only plant trees and shrubs. I wanted to do the raised garden bed as more of a feature.

    I think 20 years is good enough, but then I would probably want to change the whole design of the backyard again. With regards to drainage, how do I go about preparing the base? What is needed?

    Thanks again, much appreciated.

  5. #5
    2K Club Member
    Join Date
    Nov 2009
    Location
    Geelong
    Posts
    2,443

    Default

    Actually for decoration I would put everything into pots, on a bed of 20mm gravel and fill the space between them with loose and lightweight stuff like broken "Hebel" that way you can re-arrange things quickly and make the best use of suitable screening plants that can take over when planted in the ground, in that case blueboard and render lined with heavy (3mm ) plastic would be what I would do.
    Diosma do well in pots and smell beautiful Rosemary/ lemon scented tea-tree/ Lilly-pilly lots of options here

  6. #6
    1K Club Member
    Join Date
    Jul 2009
    Location
    Tasmania
    Posts
    1,382

    Default

    Can I also suggest that building it against the base of a timber fence will cause the fence to rot out fairly rapidly due to moisture build-up between the timber and the impervious surface of the raised bed. Better to build it right on the boundary (pending your neighbour's permission) and then install the fence above it, so you don't run into problems down the track when it is less acessible and repairs to the fence will cause damage to your plants ...

  7. #7
    Member
    Join Date
    May 2008
    Location
    melb
    Posts
    65

    Default

    Thanks Moondog. Hrmz not sure about putting them into pots, I would rather prefer to just plant them into the ground.

    Black cat, will the timber fence rot if i build a planter box near the fence? How far do i need to build the raised garden bed without the fence rotting. I've seen alot of display homes where they build these planter boxes right next to the fence, have they done the wrong thing also? Or is there a method to avoid the fence from rotting and still build the planter box right next to the fence line?

    thanks everyone for your advice!

  8. #8
    2K Club Member
    Join Date
    Nov 2009
    Location
    Geelong
    Posts
    2,443

    Default

    That depends on which side the rails and palings are, if the palings are on your side, maybe just put the blueboard straight up and seal it, that would stop the water from getting through.
    Good idea to paint the fence with a preservative beforehand or use H4 palings???

  9. #9
    Member
    Join Date
    May 2008
    Location
    melb
    Posts
    65

    Default

    The pailing is on the other side, not on my side? I thought it was the post which is in the ground that will rot? I dont quite understand. Which part of the fence will rot if i build a raised garden bed near it? I was planing on building the raised garden bed about 150-200mm from the fence. Is that enough distance without causing any structural damage to the fence in the long run

  10. #10
    2K Club Member
    Join Date
    Nov 2009
    Location
    Geelong
    Posts
    2,443

    Default

    My misunderstanding, I thought you wanted to build right up against the fence, if you have clearance then I think you can just go for it and use weed killer to keep things neat behind the garden

  11. #11
    1K Club Member
    Join Date
    Nov 2008
    Location
    Sydney
    Posts
    1,104

    Default

    Masonry best option.

    Quote Originally Posted by wonderland View Post
    Hi everyone,
    I want the raised garden bed to be about 0.6m high x 2m wide x 10m long. I am planning on building it out of treated pine, and then putting blueboard on and rendering it. I want it to look like something like this:

    I just need to ask a few questions:
    1. Do I need to think about drainage for this? I was told by a friend that I dont need draining as the water will just flow to the earth. But I wanted to make sure.
    Drainage is essential behind any retaining wall
    2. What materials do you suggest I use in terms of what size timber to buy for post and sleeps?
    Would build from masonry not timber as shrinkage will be a major factor.
    3. Would I need to put any waterproof sheets on the inside of the wall?
    Water proof masonry wall with min gripset 51
    4. Would it raised garden bed be strong enough to hold the soil
    If constructed correctly.
    5. Is there anything else that I should be aware of before I construct it?
    You wont get the look your after from doing it the way your considering. Masonry is the the only option.

    Any help would be greatly appreciated! Thank you thank you!!

  12. #12
    1K Club Member
    Join Date
    Jul 2009
    Location
    Tasmania
    Posts
    1,382

    Default

    Mine too Moondog - I also assumed the intention was to build right on the boundary line. If you have a clearance you will be fine. As to your question about what goes on in display homes - well they are there to sell a lifestyle, so yes, things are often not quite what they seem and what looks good with regular maintenance from a garden design firm will not necessarily look that good after 18 months in your own back yard ...


Similar Threads

  1. first time bricklaying - Raised garden beds
    By mikeymike in forum Brickwork
    Replies: 4
    Last Post: 6th Nov 2009, 07:05 AM
  2. raised garden beds
    By madcow in forum Brickwork
    Replies: 6
    Last Post: 5th May 2009, 11:13 PM
  3. Raised Garden Bed / Retaining Wall
    By Arry in forum Brickwork
    Replies: 0
    Last Post: 27th Feb 2009, 09:14 PM
  4. raised garden bed, what sort of sleepers do i use?
    By wozzzzza in forum Landscaping, Gardening & Outdoors
    Replies: 9
    Last Post: 13th Oct 2008, 01:51 PM
  5. raised vege garden
    By Liz5264 in forum Landscaping, Gardening & Outdoors
    Replies: 15
    Last Post: 22nd Apr 2008, 03:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •