Well, take this for what it's worth, 2 cents...I would at least cover them back up with some soil. Just thinking out loud but if they are in a swc, then you are relying on capillary effect of the water and nutrients dispersing throughout. Therefore, if the fertilizer dries out, then it won't be dispersed. That's just my thought. I didn't put anything over the top of mine either and notice that the top dries out pretty quick. I'm gonna cover with some wood mulch to keep it moist. Good luck.
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Kevin
"A world without tomatoes is like a string quartet without violins."- Laurie Colwin, Home Cooking
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