Question:
I enjoy gardening in plastic pots, but I’m concerned about the roots being damaged by heat. Will the heat penetrate the plastic and burn the plants? Besides using clay pots, are there any other options I can consider?Answer:
- Indeed, this is a genuine concern.
- It becomes more challenging for plants in the same pot over several years than for newly planted ones. As the roots expand, they fill the pot, and the soil that maintains a cool environment becomes thinner.
- Plastic pots have thin walls, and when exposed to sunlight, heat passes directly through them, potentially harming the roots near or at the walls. Plants such as mature Japanese Maples, Camellias, Citrus, Roses, and others are particularly susceptible to this issue.
- Mature plants in pots with established roots may struggle to maintain adequate hydration during hot, dry weather when watered infrequently, reduced soil volume and increased root density accelerate drainage, which can be detrimental to plants.
- Additionally, the intensity of the late-afternoon sun can be particularly pronounced when temperatures are elevated.
- The color of your container can also affect how much heat it retains. White or bright colors tend to reflect heat, while earthy tones and dark colors absorb it.
- If the temperature gets too high, over 80 degrees, water might start to evaporate. When water drains from the bottom, it’s easy to overwater plants in pots.
- To prevent this, it’s a good idea to keep the saucer empty, as water can cause root rot. Water can also seep back into the soil, keeping the lower part of the root ball nice and damp.
- Plus, there’s a chance West Nile Virus could spread from mosquitoes that lay eggs in the water.
- It is advisable to water plants in the morning, preferably when temperatures are rising. When the temperature exceeds 90°F, mature plants require daily watering. If the plants are exposed to direct sunlight throughout the day, a second watering in the late afternoon may be necessary to meet their hydration needs.
- To ensure water reaches the roots of mature plants with extensive root systems, apply a wetting agent such as Grow More E-Z Wet or a comparable product. In addition to watering regularly, here are a few more tips to help your plants thrive in hot weather.
- If it gets too hot, like when the temperature hits ninety degrees, try moving your containers to a shady spot in the afternoon. Most plants can take a little shade, especially since our heatwaves usually don’t last more than a few days.
- Plant dollies or wheeled walkers can really help you move your plants around, and you can usually find them at most garden centers.
- To keep your wooden decks in great shape, try using spacers under your pots. This simple trick helps water drain away easily and keeps the air flowing, which keeps the deck dry.
- Another trick is the “pot in pot” method! You can place a plastic pot inside a larger container. Just be sure there’s at least a 2-inch gap between them, then fill the space with small bark to keep everything cozy and help water drain away.