I'll reveal our the secrets to this garden:
Pogo pretty much mulches everything back into the garden. Every time he mows the grass all the clippings go back into the planters and decompose providing more nutrients. Most all the old palm leaves get cut up into little tiny pieces and go back into the soil. We have 4 dogs so they mulch a lot too if you know what I mean! About 15 years ago Pogo bought a ton of earthworms and released them into the soil, earthworm castings are like adding gold to your soil and makes everything grow like mad! Every little hole you make in his yard has numerous worms in it. We have gone on 4 x 4 missions just to collect mulch in the backcountry. Countless times we have loaded the F250 with oak tree leaves and avocado leafs for the garden. Pogo switches the fert up all the time too, some of the most used types are Gro Power Plus and recently Seaweed Extract. He hand-waters a lot too. His place in San Clemente has a really insane micro climate for palms, almost every morning and evening it is gloomy with fog than burns off around noon letting sun in. The house is less than a mile from the ocean too which helps. He has been there over 30 yrs...