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Just harvested my first grow and my second is underway. By far, the hardest part for me has been figuring out how much to water each time. I was using Pro Mix HP Mycorrhizae in 5 gallon plastic pots, Medi One 4-3-3 nutrients and pHing my water between 6 and 6.3. I thought that I finally got my watering right – only watering when pots felt light and top inch of soil was dry. I also watered in smaller amounts, generally every two or three days depending on how the pots felt.

This worked really well until about halfway into flower, the tips of my leaves were burning due to nitrogen toxicity. From my research it seemed that since I never flushed (watered til runoff), excess nutrients built up in the soil causing nutrient burn. I proceeded to water til runoff, and that seemed to fix the nitrogen toxicity.

However, this required giving the plant a lot more water than I had ever given it, and it ended up taking 10 days for the pot to fully dry. I had basically over-watered it. My question is, how do I flush my plant without over watering it?

I’m on my second grow now and I’m still using Pro Mix, but this time I switched to a 5 gallon smart pot, as I read they dry faster. This time I’ve been measuring out my water each time, starting with just misting the soil in early seedling stage, then 50 ml for its first real watering, steadily raising the amount of water about 10-20% every second or third watering.

If it takes a little longer to dry out, I dial the amount back or wait longer to increase it. This has worked really well and I haven’t over watered a single time this grow. I’m guessing that eventually as I keep increasing the amount of water I will get runoff. But I am already on day 56 of my grow (day 16 of flower or day 8 if you count from the first pistils showing), and am still no where near to fully saturating the pot. I’m currently at 1.2 liters of water which will dry up in around 2-3 days.

I’ve read countless forum posts and everyone seems to water until runoff, even in the veg stage. I feel like I’m crazy, cause I’m in flower and feel like if I watered til runoff right now my plant would take at least a week to dry out, and maybe longer. How is everyone else watering til runoff (even in pro mix) and I’m unable to without severely over watering my plants?I’ve read countless forum posts and everyone seems to water until runoff, even in the veg stage. I feel like I’m crazy, cause I’m in flower and feel like if I watered till runoff right now my plant would take at least a week to dry out, and maybe longer. How is everyone else watering til runoff (even in pro mix) and I’m unable to without severely over watering my plants?

Thanks guys. I love the show and have been watching regularly since finding it.