Yes, I'm singling out a single nutrient for special attention: Nitrogen. As mentioned in my previous videos on fertilizer for roses, nitrogen is only one of several nutrients required by roses in relatively high quantities, so why single it out? Because it's commonly deficient and doesn't stick around for long in the soil: regular supplementation (within reason) is likely to improve growth and flowering without much risk of accumulating to unhelpful levels.

Now my preference has been to supplement the nitrogen levels using a green amendment, like alfalfa, which also adds a wide range of other nutrients (at much lower levels) and organic matter. That said, the plants don't know from where the nitrogen comes, so do what works for you!

Here's the cut flower nutrient guide I referenced in the video:
https://mda.maryland.gov/resource_con...