Fertilizer I use is Miracle Grow, the original one, half strength every two weeks. Soil is organic container potting soil with some Vermiculite and some Perlite added to help keep it light since these are container plants here in the Midwest. I topped off the soil with about 2 inches of mulch to help keep moisture levels more constant and prevent drying out or over heating. This summer was fairly mild, so on the few hot hot days, I moved the portable fig forest closer to the end of the patio where the neighbor's japanese maple would provide a bit of shade from 3pm til about 6:30pm. Other than that, they stay in full sun.
I'm currently patiently waiting for the bright purples of fully ripe. Think another 3 or 4 days! Supposed to get thunderstorms and or rain later today, if so - I am bringing these Black Jacks under cover so they don't get watered down or split.
I'm thrilled others are appreciating these lovelies!