+1 About 3 weeks from your last app and you should be just fine :thumbup:Colonel K0rn said:3-4 weeks should be sufficient. I plan on applying it for a month, which will allow the plant to store up the scientific name stuff that allows it to grow vertically (I think it's gibberellic acid), and when it's ready to wear off, the plants will have enough of that to allow it to power grow through the sand that I'll be applying on top.