My Nimbus 2000 broomstick with its extendable wand.
Must not be flown in windy conditions.
Contrary to opinion, glyphosate can be used at any time of the year. The critical factor is that the weed must have living green growth. In the winter months, many perennial weeds are dormant and it is useless to spray. I have, however, sprayed green couch grass in late November, with complete success. Weeds emerge from seed throughout the year. If they are growing, they can be sprayed, and I do so all year round. In winter, weeds will take six or more weeks to die, but who cares as they fade away. It is particularly useful to spray in autumn and winter when the soil is too wet for hoeing and garden plants are dormant.
Standard advise on the can is that six hours must lapse before any rain. This is correct for thick weed cover. For difficult perennial weeds, a day or more is even better. Usually my own ‘spot spraying’ is of seedling weeds. If rain does not immediately threaten, I just go out and spray. Over thirty years I have sometimes been caught out, but if it stays rain-free for an hour, I have not wasted my time.
A curious consequence that I have observed, is that if rain is very light and lasts only a few minutes, it actually enhances glyphosate’s effect on small weeds. Young plants capture precious rain and by a process of ‘stem flow’, channel it to thirsty absorbing roots at the base of plant. Within a very short while, of course, glyphosate in the soil will be broken down by bacteria and will leave no residue.