- Poison rose black spot with tomatoes
It’s long been known that roses grown next to tomatoes are less likely to fall victim to black spot. Make a fungicide by snipping tomato leaves from a plant and processing them in a blender with a little water; use enough leaves to make 2 cups (500ml) slurry. Combine with 1.5 litres water and 2 tablespoons cornflour and mix well. Store the solution in the fridge, marking it clearly with a warning label. Spray your rosebushes once a week with the fungicide.
- Repel caterpillars with onion juice
Spray cabbage and other vegetables that are targeted by caterpillars with onion juice and watch them take a detour. To make a spray, peel 2 medium-sized onions, grate them into a large bowl and add 4 litres water. Let the mixture sit overnight, then strain it into a spray bottle. To make the plants smelly enough to repel the pests, you may need to spray the leaves twice.
- Soup-can stockades
To keep cutworms and other crawling pests from reaching newly planted seedlings, use soup cans as barriers. Cut the top and bottom out of a can, wash it well, then place it over a seedling. Twist it until the bottom is 5cm underground and your tender seedlings will gain protection from all directions. Paper cups with the base cut off can be used in the same way.
- Fight fungus with bicarbonate of soda
Keep powdery mildew, black spot and other fungal diseases from infecting your fruit trees, vegetables, gardenias, roses, etc., with a bicarbonate of soda solution. In a large spray bottle, combine 1 teaspoon bicarbonate of soda, 1 teaspoon washing-up liquid and 1 litre warm water. Shake well and spray plant leaves and stems on both sides to discourage fungal diseases from taking hold.