TheGardenLady received this question from Michelle.
I live in NYC, and would love to plant flowers and herbs outside my apt. Outside our kitchen window is a blacktop roof. I’ve tried to grow basil and parsley, but they never stay moist enough–sun is too strong. But, I would like to build something bigger to include many flowers and herbs. What would you suggest?
What a lovely idea to use the roof for a garden. However, in your case, living in NYC, one has to be concerned about the weight of plants on an old roof. Your landlord might object. If you think the landlord does not object, TheGardenLady recommends using light weight things for planting.
Plastic pots weigh less and don’t dry out as easily as clay pots or aren’t as heavy as ceramic pots. Also, if you will be watering the plants, you have to be sure that the water will run off and not seep into the roof – down into someone else’s apartment. You don’t want plants that need a lot of watering.
Attempting to grow herbs is a good idea because herbs do love sun. Most herbs come from the Mediterranean area where they get lots of sun which is needed for the herbs to have strong herbal flavors. But growing in a field is different than growing on a roof. TheGardenLady imagines that it is probably due to the blacktop roof that your herbs are drying out too quickly. Getting all that heat from the sun plus the heat from the black bottom under the pots might create too intense a heat and cause the small amount of soil in the pot to dry out too quickly.