Plant compost

[lynbrown]

Im putting in some plants-violas etc - inot pots on my patio. How often should I replace the compost or can I just top it up when required? I also have a large bag of compost in my garden box which has been open for a year or more. Is it OK to use that?

[penelope2]

Mix a sprinkling of Blood,Fish and Bone with it, that will keep things going for the growing season.

[lynbrown]

Where do I get that?

[penelope2]

Any nursery or B&Q. It's in powder from and not that expensive.

[boxtops]

I usually change my compost in pots every two years. The stuff in the bag will be fine.

[hammerman]

In a big tub, i usually change 25% each may time. I mix the new compost with the existing old stuff and add either growmore or fish. blood and bone as mentioned above. Mix the fertilizer in well.