Yes you can fill them, but I find the new ones growing among the original plants tend to get shaded out, at least if you plant as dense as I do. I have gone to a method of densely planting cukes and it seems to work well. Along my cattle panel, I sow two parallel rows, ~4" apart, in a 12" wide area along the panel and place seeds every 1". I cull weak looking ones, not all germinate and leave the rest. It works well for me.
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