Can I use NovaMax Grow and NovaMax Bloom at the same time?

NovaMax is a one-part nutrient. You would usually use NovaMax Grow on its own during the vegetative stage and NovaMax Bloom during the growth and flowering period.
However, during transition periods (growth to flowering) and with semi-cuttings, you can mix half and half from each of the bottles, which will give you a more comprehensive solution.