OK. I will continue.
For long-term plants. I remove each every year. I put them in clumps in the shade. Then to the boxes I add fertilizer, usually slow release. Palm fertilizer from Lesco is good. Depending on the plants, I can mix in 10-10-10 or lawn fertilizer (no weed control). Now I use 360 fertilizer that is 18-6-8 (same as lawn fertilizer but 360-day slow release). Some of this is on Amazon. I have a friend who goes to Apopka as gets 50 lbs for $60. He sells it to me for $60. I add new new Jungle Growth to the boxes, turn in the fertilizer and replant.
For the veggies. I have to move plants around so they don't transmit diseases--think tomatoes, peppers, etc. I add soil and fertilizer to the boxes. Sound familiar? When we get torrential rain or hurricane rains, the soil gets compacted. That means adding something like Miracle-Gro with light ingredients, perlite, and fertilizer. Add, then turn the soil over. I do still add slow-release fertilizer depending how long I expect the plants to grow.
I am growing peppers and tomatoes both in boxes and pots. I dump the pots and maintain the boxes. If you have any questions, just ask or tree-mail.
Good luck!