I have three different beds with a variety of tomatoes, peppers, squash, cukes, green, herbs and flowers. I just purchase granular Miracle Gro Tomato & Veggie blend. Any know if I get away with using this on all my beds and containers or should have more than one blend? And, can I use it on my lantana? I have two in pots and one in the ground.

The blend is 18-18-21.

I hand water with a watering can so I'm mixing this up 2 gallons at a time.