Top dressing with dr earth veg all purpose an flowergirl

This sort of thing is a grey area. Rate of growth will surely impact it, for example. So, you'll have to trial and error the next few grows that make use of this sort of system. Even when familiar, be open to the idea that consistency may not be perfect in future. It'll always be a ballpark or a reaction to the plant showing a symptom. if you want to be a bit conservative the first time and get a good guage of how long you can go, i'd wait for lower leaves to show a hint of deficiency, then start top-dressing. In future you can start this a tad earlier to avoid that deficiency. over time you may find if you start a bit early you may need to reduce strength that first feed... all sorts of tools in the bag to make small adjustments. Find a happy medium and try to stay consistent with how you do it... change one factor at a time and you'll quickly have a standard operating procedure that will be clockwork.