You can use the tomato formula for peppers and cukes, but they need more N than tomatoes.
Here is how HG handles that without you having to buy their pepper or cuke formula:
"Yes, you can grow other plants with the Chem-Gro tomato formula 4-18-38. Certain plants like cucumbers or peppers need a little more nitrogen. So, you will need to supplement those plants with extra nitrogen. Here is what we recommend:
Dilute 1 teaspoon (1 tsp) of Calcium Nitrate (CaNO3) in 1 gallon of water. Each plant will get 1 cup of that solution 1 time per week.
This is done in addition to your daily watering with water mixed with the 4-18-38 according to the proper mixing rates for your age of plants."
I have my cukes on the same injector system as my tomatoes, but do the above once a week. I have picked 30 cucumbers in the last 2 weeks from 12 plants. And the plants are loaded with various sized fruit from top to bottom still. I'm doing the umbrella style trellising system. Plants are almost to the wire.
Next year I will probably cut the number in plants by half...
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