I've done multi pots, I think those 3 will deplete it before the end. However if you re ammend with a your recharge and charge... You should be OK.. You are gonna have to try and prepare for it before they go hungry... Its a guessing game.. But i reckon if you go 3 weeks on water, then top dress with recharge and charge.. You should catch it before the soil is depleted and keep em mean and green with maybe some bloom boost... If your sticking with organic for a bit, get some Biosys and weekly water with that, it's great to keep the soil alive and my plants always love it.