Posted: 23/02/2014 at 19:29
Never use Growmore. For me it's very caustic and any wildlife in the soil is destroyed by contact with it until dissolved. Organic fertilisers are slower acting, except dried blood, and far more gentle to the soil.
Use just prior to seed sowing, in early spring for plants and again in late/mid summer to re-energise plant performance until autumn. I've come to use less fertiliser now, organic or artificial, preferring to add compost/manure to soil.