Make sure boxes have proper support. The load-bearing capabilities of your balcony also must be considered before planting heavy containers. Scrub old pots with a 10 percent bleach solution before re-using. This will kill disease and pests and will help remove any accumulated fertilizer salts. Shield container plants from midsummer heat by using a lattice, awning, umbrella or shade fabric.
Containers fend off heat and wind and retain moisture better if several are arranged close together.
Season new terra-cotta pots by submerging them in water for 15 minutes before filling them with soil. This will force air out of the pore spaces and help keep the soil moist. Consider putting casters on wooden planters or putting your large pots on a little dolly before they're filled with soil. A 30-gallon planter can weigh more than 200 pounds. Head off unnecessary heavy lifting by filling and planting containers at the site of their final destination.