London (change)
8 messages
04/03/2013 at 17:23

i have a chance of free builders lime. the type they use on building it o,k to use on my allotment for brassicas. as i am riddled with club root. i am worried it could kill my worm population.any help please.mick.

04/03/2013 at 18:08

Builders lime is also know as hydrated lime and can be used in place of garden lime (which is basically ground limestone.)  You have to be a bit more careful when spreading it as the dust is an irritant, so make sure you don't breath it in, keep it off skin and protect eyes.  Builders lime is about half as strong again as garden lime when it comes to its acid-neutralising properties, so you only need to use two thirds as much as you would if spreading garden lime.

04/03/2013 at 18:45

thanks bob. i/d have been feeding too much.

04/03/2013 at 19:09

No problem wrinkly1 - hope you manage to beat that clubroot.  One thing which helps against that is to raise the plants in 3.5" pots and grow them a bit bigger then normal before planting them out.

04/03/2013 at 21:38
Oh dear Bob, I have just thrown a big big bag of builders lime away as someone told me it was just a soil improver and didn't alter the ph balance.
04/03/2013 at 21:52

Never mind, Lyn.  They were probably thinking of gypsum, which can be used to improve clay soils without affecting pH.  The RHS has a pretty comprehensive section on the various types of lime:


05/03/2013 at 10:26

Ah! thats what it was Bob. Gypsum, thank you, I dont feel so bad now.

05/03/2013 at 18:34

bob. i/ve jjust read the RHS link you left. it makes it so pay/s to ask .many thanks. 

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