BTW....I had a good chinwag with a Soil Expert from the University here....we wagged on and on about Asparagus. He suggested that I 'goose' my plants with a foliar feeding of Potassium Nitrate - at about 2% solution. After the asparagus I sprayed my newly rooted cuttings in the gh with a 1% solution and 2 days later I see a lot of growth/improvement.
Caution: not to be used randomly. He suggested once every couple of months.....