I mixed together what I feed/water our tomato plants with for the onion seedlings. It may kill them, or work, or make no difference. What I mixed:
2 cups room temperature water
1/8 teaspoon Epsom Salt
1/4 teaspoon 15.5-0-0 Calcium Nitrate
1/8 teaspoon 4-18-38 MasterBlend Tomato & Vegetable formula
I figure, "Why not try" because water and pro mix isn't working.
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