Expert: Mike Mascio - 2/4/2009

Question
Hi. I'm wondering how to make the best environment for roots in the bottom of containers with no draining holes --For instance, a long metal window box that I'd like to grow morning glories in so that they'll screen my window.
I'm surprised how many pots -almost all the enamelled ones-
have no hole in the bottom. Thank you. (I'm in Los Angeles, CA)

Answer
Cassandra, drainage holes are critical in order to prevent root rot. Since your containers have no drainage hole, it is important to regulate the amount of water as much as possible.

I would purchase a water meter at your local garden center. These devices are relatively inexpensive and highly accurate. Remember to water deeply and only as frequently as required. Shallow watering causes the roots to reach for the surface. It is vital that the roots reach straight down for moisture. Only water when the top 2" of the soil dries out.

Finally, space the plants at least 6" apart. This will allow enough room for the root systems not to compete with one another for water and nutrients.

Note: You can always drill small holes in the bottom of the container to resolve this problem. Just be sure to use sharp bits to avoid cracking the enamel.

I hope this information helps. Please write again if I can ever provide assistance.

Regards,

Mike