How deep should the compost be?

Recommended Posts

Constructing my first "half barrel" bog garden.

I have seen other excellent posts on here regarding the construction, including using polystyrene chips or similar at the base around an upturned bucket with holes in, to help reduce weight and also reduce the amount of compost required to fill it!

Can someone tell me the depth of compost required above all the filler components?

Many thanks


Link to post
Share on other sites

Hi Phil

Sarracenia particularly make a lot of deep roots when growing healthily, although they don't mind the roots getting pot bound. if you can give them 12-18" or more of depth that will be ideal. Be a little wary of your infill materials in the reservoir, plastic pots buckets etc are OK but Styrofoam and polystyrene I have heard (sorry I dont know for sure) leach chemicals into the soil over time which could cause problems. also beware of rocks etc as they can also contain minerals that will leach into your soil and cause grief to the plants. Remember the soil and water will be acidic so judge what you put in accordingly as anything that is not inert will react with it.



  • Like 1
Link to post
Share on other sites


Careful with the polystyrene. I did a bit of reading up on it and found that it does leach into the soil. I went against most advice and used it anyway, albeit in a tightly sealed heavy gauge plastic bag. Time will tell as to whether I get away with it or not.

As a result I've probably got nearer 8" of substrate above all the gubbins inside - less in places (barrel was only 15" deep to start with). Again, time will tell if this works, but everything seems relatively ok thus far. I'll post a picture of how it looks now when I get chance over the next couple of days.


MBE. :sun_bespectacled:

Edit: photos now added to the construction thread.

Edited by mrbadexample
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.