Do you have to use bloom neutriants?

Changing your NPK ratio throughout the different stages of your grow is essential. Nitrogen is is the building block for leaves and plant structure, phosphates the building blocks for flower. If you feed too much nitrogen throughout flower and especially late flower the plant takes up the nitrogen and is forced to use it, which leads to it investing more energy and resources in producing leaves and stem and not so much flower(bud). You'll end up with really leafy, minimal flower bud. You want to feed high nitrogen veg and slowly use less and cut it out late flower, in my opinion.

It definitely necessary infact I'd say if it's a necessity to have just one bottle or would be flowering nutes and let it veg without.

it would be like using MH light throughout. You can,but your yields will be diminished . Instead,if I had only one chance, I would go with bloom for whole grow.

I actually only use Cal-Mag, Micro, and Bloom for the whole cycle, I've use this regiment on photoperiods and autos and it works like a charm. What a lot of people don't know is that there is enough nitrogen for the veg cycle in the cal-mag and micro so the grow nutrient isn't necessary. I use the bloom to help with root growth early on and then, of course, it's needed once the plant is in flower. Remember that less is better when it comes to nutrients ... Good luck with the rest of your and if you need specific amounts shoot me a PM and I'll send them right over.

Switching is the way to go.. The plant uses different nutrients at different stages. You might be able to balance something that would make it grow the whole way... But it would never be as effective as targeted grow and then targeted bloom food. IE. It's need lots of nitro in the veg stage but the mid to late bloom phase uses much less nitro, if any at all.