az2000
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Should I water till runoff directly after transplant.??
I mix 1/4-strength bloom nutrients, pre-wet the bottom of the larger container's soil. I pour the runoff back through to get it very wet. Then move the smaller container's contents into the larger (hopefully the bottom pre-wetted layer is tall enough for the old container's content to sit almost flush with the top of the new container.). Fill in the sides with new soil (not wet yet. Although you could prewet it.). I water those sides, and the old soil in the center using the 1/4-strength bloom nutes. I pour the runoff back through the sides to make sure they'e saturated.
That's the only time I ever pour runoff back into the soil, when I'm pre-wetting and transplanting (to get the sides saturated). I might pour it in 3-4 times with a few minutes between each pour, make sure it is satuated. If you pre-wet the soil, you wouldn't reuse the runoff the way I do. But, working with prewet soil is sloppy/messy. I've never had any problems (that I noticed) from this wetting using the runoff.