Posted: 04/08/2015 at 23:56
Liquid feed or manure should never be watered on plant leaves, but the roots of the plants should preferably be drenched. Perhaps some of your plants can tolerate their leaves being watered by liquid feed, whilst the damaged ones are more susceptible to damage? I' m not suggesting you covered your plants with liquid feed, but we need to be very careful with the strength of the mixture, and if homemade, from nettles or comfrey, it can be too easy to make it too strong and cause burning.
good luck in your investigations!
ps. Not wishing to sound too gloomy, but aminopyralid has been found in many commercial composts and bags of 'farmyard manures' - and they are still on sale in some of the largest DIY and garden centres.........