Water your potted geraniums roughly 1 to 1.5 inches per week. During winter months they must be watered much less to 1 inch every 10 days.
Hydrangeas
Hydrangeas follow a difficult schedule of being watering 1 inch of water 3 times a week.
Begonias
Soil for your begonias should be slightly damp at all times, with 1 inch of water 1 to 2 times a week.
Crysanthemums
In the summer, chrysanthemums need to be watered 4 to 6 times a week with 1 inch of water. During cooler months it only needs 1 inch about once a week.
Petunas
Petunias are sensitive to over watering so only 1 inch of water is needed per week for a standard 10 inch pot.
Marigolds
Marigolds require 1 to 2 inches of water every 7 to 10 days.
Mandevillas
Water your mandevillas with 1 inch of water once a week.
Impatients
Impatients require an intense schedule and will need watering daily with 1 inch of water. When temperatures rise above 85 F water twice a day with 1 inch of water.