Try to find the NPK ratio of your fertilizer somewhere on the packaging . N is nitrogen, P is phosphor and K is potassium, so these numbers give you the respective contents of your fertilizer for the 3 most important nutrients for plants.

Then try to google the optimal NPK ratios for other plants you might have. If it’s close enough to your fertilizer’s ratio, it should work fine for those plants too.

Bumped into my brother’s ex GF on a Grand Canyon trail, when we both live in Europe.