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I've got that sinking feeling, in my planter.....

DaveKearleyDaveKearley Posts: 130
edited July 2022 in Problem solving
Some may have seen it before but i have a very large planter I built just over a year ago, 1st garden project. Its 2.4m x 2.4m x 600mm. It took over 2300kg of soil to fill plus 500kg of large gravel at the base.

The soil compost has really settled badly despite watering etc, it's now about 6" lower than where it should be. I can easily add compost to raise it but that won't raise the plants - is there anything i can do here?

My only thought is to wait until later in the year, raise each plant, add soil and re-plant the plants, working my way round. ?

It's holding Dianthus x3, Delphiniums x2, Heuchera x2, Cortaderia x1, and a couple of other small ones I can't remember.



Posts

  • JennyJJennyJ Posts: 10,576
    All of those should be OK lifted and replanted in the autumn or spring.
    Doncaster, South Yorkshire. Soil type: sandy, well-drained
  • DaveKearleyDaveKearley Posts: 130
    Thanks, thats what i thought.

    It will probably be cheaper for me to get another 'dumpy' bag delivered than using the smaller garden centre ones.
  • Rather than get a dumpy bag i got some large bags of 'peat free' compost, i also now have a good pile of soil from a pond i'm digging. The peat-free worked out cheaper and meant we could grab a couple of bags each time we visited the garden centre.

    I guess it is good/acceptable to mix the topsoil in with the peat-free and fill the planter with the mix, should I mix in some type of fertiliser too?
  • I wouldn’t add fertiliser at this time of year … it’ll encourage new growth which will still be tender when the winter comes. 

    I would add some Fish, Blood & Bone in the spring. 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • bédébédé Posts: 3,095
    edited September 2022
    Was it was just soil you used in the original planting?  This will have compacted and washed into the spaces between the pebbles.  A thorough remixing might be necessary at the time of  the peaty addition and replanting. 
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • bédé said:
    Was it was just soil you used in the original planting?  This will have compacted and washed into the spaces between the pebbles.  A thorough remixing might be necessary at the time of  the peaty addition and replanting. 
    It was supposed to be a mix of soil and compost, sold in dumpy bags as "ideal for large planters and general use". I think it was 99% compost and was hot when it arrived, it was steaming.

    It does seem to mulch down a lot, its dropped about 10" in a year and was topped up a bit during early summer. I'm new to this so just bought what seemed correct, a few plants disagreed with it and died but mostly they seem happy now.
  • When would be a good time (sooner rather than later) to do this work?

    The Delphiniums have put on a third show which is nice and the other plants are calming down now its cooling off.

    Is it possible to just lift the lot, line them up on the patio and then rework the soil in the planter? I was thinking of doing it bit by bit but a single-hit would make combining the soil/compost easier.
  • Lizzie27Lizzie27 Posts: 12,494
    Yes you can lift the lot, probably after watering them well so they don't dry out, lay them on a groundsheet or plastic and cover them with more plastic temporarily. It would be better to mix your compost/soil together before putting it into the planter. I'd then water it well to settle it in as you may well find the level drops again, then replant your plants. Water them again when that's done and keep them watered while they are re-establishing if you don't get any heavy rain.

    I find that the level in most planters do tend to drop and we add more to ours, usually in the spring.
    North East Somerset - Clay soil over limestone
  • Took the plunge and sorted out our sunken garden :)

    It took 700ltrs of compost plus a large pile of topsoil from the pond project to raise it to where I wanted the levels!



    Looks a lot better now, hopefully I didn't upset the plants too much. There are a couple of spaces now, going to stick some Begonias in there - we have two growing in pots at present (red one is just on the left of the picture) and they have really bloomed well, we like them.
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