I'm a new grower but I have 6 plants that have been flowering for 4wks now.It says on bottle of overdrive best when use in wk5&6 but can I use it earlier?
Use 2 mL per Liter during weeks 5 and 6 or the last 2 weeks of your flowering phase.
And honestly, you can use any nute early, if you want. It's always up to you...and your plants. If your plants are happy, that's really all that matters.