Starting Your Container Garden (NGA – Moss in the City)

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Moss in the City – Gardening in Small Spaces

Starting Your Container Garden

The popularity of container gardening is exploding. Municipalities, park districts, and businesses are leading the way with colorful planters and urns that change with the seasons. The convenience of containers makes it possible for homeowners and apartment dwellers to join the fun, too.

The first step is selecting the containers. Your choices depend on your space and the type of plants you want to grow. Pots should have drainage holes so roots don’t sit in water and rot. Only a few plants (e.g., calla lily, rain lily, water iris) can survive in containers without drainage holes.

Selecting the Right Pot

Terra-cotta, wood, and other porous materials have the best drainage, which has advantages and disadvantages. The better the drainage, the less chance of root rot, but the greater the chance of roots drying out. If you are a forgetful gardener or if you travel a lot during the summer, choose a less porous container.

Ceramic, plastic, and other solid materials hold water much longer. Use this to your advantage. I often plant annuals in a terra cotta pot with a drainage hole and then insert the pot inside a ceramic container. This gives the best of both worlds by greatly reducing the amount of watering yet also reducing the chance of root rot. Plus the ceramic pot is more decorative.

The other consideration when choosing a container is weight. Toting a large ceramic container or wooden barrel up flights of stairs can be tough. Ease of transport is definitely a factor that affects your enjoyment of gardening. Plus, you need to consider the weight limits of your balcony and the strength of the wind. Check with your condo association for balcony limits. As far as wind goes, you have to make an educated estimate. If you have lots of breezes with the occasional gust, you may not want to choose lightweight plastic pots, especially for tall plants, because they may tip over. Heavier pots are better for windy areas.

Choosing a Soil Mix

I recommend a good quality, sterile soilless mix that’s formulated for container growing.


Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.