In article , H Ryder
writes
My soil is compacted clay, with hardly any worms. Have decided to try double
digging the borders. Is this a good idea?

Probably not. The clay you have at the surface is as nothing to the clay
you'll have two spits down.

What should I dig in - I've got
some sharp sand and compost. Will this do - I can't really afford grit .
Would appreciate any advice

Also what is the best technique for actually breaking up the great, hard
lumps.

A pickaxe.

Hitting them with a spade just seems to make them harder! TIA,


Spread a 6 inch deep layer of compost over your borders. Worm activity
will incorporate the compost into the soil (they're fast breeders, and
even though you don't have many to start with, you soon will once you
start spreading compost).

Meanwhile start a compost heap if you don't already have one, and
continue spreading 6 inch of compost each year.

This will be more effective than trying to improve the soil by a once-
off digging in of compost and sharp sand.
--
Kay
"Do not insult the crocodile until you have crossed the river"