My roof top container garden

Orchids are delight for every gardener. They are not easy growing plants. A slight compromise in amount of sunlight, water, fertilizers may kill the plant. I have a variety of Orchids in my garden ranging from Dendrobiums, Vanda, Catteleya to Oncidium varieties.  Each of these varieties have different types of requirements. The potting mix that i use is mixture of coconut husk, charcoal and small rounded pieces of bricks. I prefer to keep them under shades ensuring that they donot get direct sunlight. The watering is done once in every two days in summer and in rest of the year I water them only when the potting mix is dry. We have to make sure that the pot has plenty of holes. Since it was very hard for me to find such pots, I decided to go for DIY( do it yourself). I took mineral water bottles and cut them into half, after that i punched many holes into it, so that all the excessive water drains out. These pots also ensures that the roots get plenty of light since they are tran