Container gardens are the only choice for a balcony or rooftop, and are prized because they add color and interest to these spaces. When you’re planning a container garden for one of these spaces, there are certain considerations to keep in mind.

The first is weight and drainage. Pots, especially when filled with potting mix and plants, can be very heavy. If you live in a condo or apartment, you may need to check with your building association or landlord to see if there are any weight restrictions or other regulations.

Even if there are no restrictions, you may want to check on the load-bearing capacity of your structure if you want anything other than a couple of small pots.

Sun, shade, and wind are also considerations. Take a look at—and feel—your intended garden space over the course of a growing season to determine just how hospitable it is to plants. Sun can be intense on an exposed roof, and balconies may have increased light and heat reflection from walls. You may need to add some partial shade to help prevent sunburn or overexposure.

In some cases, overhead structures and site orientation may cause balconies to not get enough sun for any but the most shade-tolerant plants. In this case, choose plants that can take lower light levels.

Wind can be a major factor on rooftops and balconies. If strong winds are common, you’ll not only want to protect the plants but also take measures to be sure your containers won’t be blown over—or away. Adding screens or panels and anchoring the containers can help.