PEAKBOOST is an extremely concentrated phosphorus booster that’s highly available to plants. With the introduction of APTUS BASE, we’ve aligned the PREMIUM PROGRAM to have synergy between the phosphorus in both PEAKBOOST and BASE. This has resulted in a lower dosage. Note that the legacy EXTREME PROGRAM is still acceptable if using another base nutrient product.
Yes, you can extend the use of PEAKBOOST for longer flowering cultivars. For 10-12 week cultivars you would typically extend week 4 of the feed program for an additional week, and then do the same for week 6.