The big bag is organic but Flora Nova isn't. Both should be enough for both plants. It's more a choice of synthetic immediate release (you'll have to dose the flora nova every other watering), or slow release organic. You have more control over the first but the second is easier. Or you could go buy a bunch of separate amendments like P high bat guano, kelp meal, ... and amend half of it in and make teas with the rest. It all just comes down to personal preference. My personal preference would be to amend with many different organics and water with a weekly tea on top of it.