Foliar feed and Powdery Mildew preventative.
Spray every week.

1 litre mix
900ml weak black tea (1 tea bag steeped in lt water. I use, used tea bags, plenty of tea left)
100ml milk (fresh, not UHT)
50ml Worm Tea (optional)
10ml (2tsp) bi-carb
5ml (1tsp) epsom salts
5ml (1tsp) urea (water soluble nitrogen)
10ml vegetable oil
10ml seaweed (optional, but a great tonic for your plants)
5ml  dishwasher liquid
tip: Always put the soap in last or you'll get too much foam

Put it in a spray bottle and mix well to dissolve the bi-carb or it will block the spray nozzle.

Spray the plants thoroughly making sure the leaves are completely wet, top and bottom.
Spray in the evening for best results.

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