On a blazing patio, I size pots like I size a client engagement: give the plant room to grow without starving it between touchpoints. One heavy feeder per container, and I go at least 12 to 16 inches wide for tomatoes, peppers, or a mixed pollinator pot; cramped roots in small plastic equals daily panic watering. If the balcony catches west sun, darker pots and tight groupings amplify heat, so I leave air gap between containers or slip lighter-colored sleeves around black nursery pots.
Soil mix is the foundation, same as technical SEO under content. I use high-quality potting mix, stir in compost for slow release, and add perlite or bark fines so water moves through instead of pooling after a summer storm. Garden dirt from the yard compacted on me every time; don't repeat that experiment.
Watering rhythm beats volume guessing. I deep-water at first light most hot weeks, until it runs from drainage holes, then I empty saucers so roots aren't sitting in tea. A quick finger check in the top inch is my KPI; if it's dry there, the core is usually thirsty too. Evening sprinkles mostly grow mildew on basil and don't fix a dried core.
The routine that's stretched bloom and harvest for me is a Sunday morning ten-minute audit: deadhead, look under leaves for pests, rotate a quarter turn off the railing that radiates heat, and top-dress with a thin mulch layer. Small scheduled care beats a heroic rescue when everything's already crisp. Since we moved to dawn watering plus that weekly pass, my container herbs kept producing weeks longer than neighbors who watered whenever they remembered.