Gertens Greenhouses Gertens Greenhouses

Store Hours

Google Map
You have no items in your shopping cart.


Ideal Conditions for Healthy Houseplants

Share |

Once the weather cools and the snow starts to fall, most gardeners enter a deep “green depression,” unless they know how to maintain ideal conditions for healthy houseplants.

Houseplants can give many health benefits, from cleaner air to a better mood in Winter!

I hear countless people walk through our doors this time of year, take a deep breath, and sigh. Then they head for the plants. When asked if they need help or if they have questions, most just shake their heads and say that they just need a little bit of spring to help get their gardening fix. Indoor gardening can help people get through the winter doldrums, and in cases where people don't have a yard, it is the only option. Besides winter therapy, houseplants have many other benefits. Not only do houseplants clean the air, but they also brighten dark corners and provide color, texture and interest to your home.


Houseplants are simple, they only have a few basic needs:

Easy to use soil moisture and light meters can help you ensure your houseplants receive the proper water and light.


Since most houseplants are tropical, temperatures are important. Most of our homes are warm enough (although cooling it off by a few degrees at night would actually help our little green friends). Most common houseplant dislike hot and dry conditions. They prefer a cooler, moister condition than is typical in our homes. Tropical areas tend to be warm and humid during the day, and much cooler at night. Our homes tend to keep roughly the same temperatures during the day and night, and with our methods of heating, the air tends to be much drier than most plants need. Dropping the temperature as much as 10 degrees at night and you will find some plants will reward you for it. For example, Phalaenopsis (or Moth) Orchids tend to bloom with short days and cooler nights!


Plants need light, but different plants have different requirements. Try to match indoor plants to the environmental condition of your home. There are 3 key aspects of light to keep in mind: Intensity, Duration and Quality.

Intensity is the strength of the light. An example would be a south facing window with full sun, compared to a north facing window with no direct light. The light may come through the window for the same amount of time, but the south window has a much more intense light than the north window.

Duration is the length of time the light is available. Compare an east window with a south window. The east window will get bright light, but for a much shorter period of time than the south facing window.

Last but not least would be Quality. There are many artificial light sources, but nothing beats the natural light of the sun!

During the winter, our days are so short that there is never enough light. You may have the best location in front of the proper windows for each plant you own, but the angle of the sun and the length of the day rob us of our much needed intensity, duration and quality. Because of this, our plants still suffer and drop a few leaves here and there as they try to accommodate for the lack of light. Don't be alarmed! It's winter and they will return to normal when spring comes. Using a grow light will help to counteract the lack of light during this time of year, but make sure that you are familiar with the different types of lights and how they are meant to be used.
Natural sunlight is the best light for a houseplant.

Another often overlooked secret is to clean the leaves. Dirty leaves block sunlight, glorious sunlight. Wipe the leaves with a damp sponge, or if your plant is easy to move, simply put it in the shower for awhile. Keep the temperature of the water tepid, not warm or cold.



Plants need water. Plants tend to need less water during the winter than when they are actively growing, however, different plants have different water needs. During their active growing season, most tropical plants need moist, but not soggy soil. How do you get consistently moist soil without over watering? Good question! Each plant is different, they use different amounts of water based on how they are potted, how much sun they get, how warm they are...etc. The only way to truly know the answer to that question is to know your different plants needs and then observe the plant in it's new environment and be ready to react to changing conditions. Some plants need to dry out slightly between watering, some need to stay moist at all times, others need to dry completely between waterings. Easy to use soil moisture meters can help you ensure your houseplants receive the proper water amount.

Sometimes we forget to water until it's too late. If the soil has dried out completely and is shrinking and pulling away from the edge of the pot, it is unlikely to get properly re-hydrated with regular watering methods. The best thing to do is fill the sink or a pail with tepid water and plunge the whole pot under water. It is really best if the water is over the surface of the soil. If it floats, hold the entire pot under the water surface or weigh it down so it remains submerged. Leave it submerged until it stops bubbling (a few extra minutes won't hurt). Drain and if the plant is wilted, set it in a cool shady spot to recover. Remember that plants don't need as much water in the winter as they do during the summer. Keep an eye on your plants and adjust their care accordingly.


Heating in our homes dry out the air to desert-like conditions. During the summer most homes (without air conditioning) have humidity levels in the 40-60% range. This is perfect for indoor plants. It is dry enough to inhibit fungus, but moist enough to keep them comfortable. During the winter however, with our heaters blazing, it is common for humidity to drop below 30%. Desert air has 10-30% humidity...much too dry for all but the cactus and succulents. Rooms, such as the bathroom or kitchen, which tend to have a little higher humidity are a little more plant friendly. If you want to keep your plants in drier areas, there are some things you can do. Adding a humidifier to a room will definitely help, but there are easier ways.
Humidity can be key for keeping plants healthy in winter.

  • Group plants together. There tends to be more moisture around the pots (full of moist soil), and the air that is trapped around their leaves. Be careful with plant groupings though. They don't like to touch each other and need some “personal space”. Close but not touching will keep them happy together.
  • Misting plants can help to raise the humidity. Make sure to only mist plants in the morning, so that the leaves can dry before nighttime. Don't forget to mist both sides of the leaves, not just the top. Misting also helps to prevent spider mite infestations; mites love dry air!
  • A pebble tray is the best way to raise the humidity around a plant. A pebble tray is simple. Fill the tray so that the plant sits on top of a layer of small stones rather than the base of the tray. Fill the tray with water and with the plant on top of the pebbles it won't be sitting in the water. As the water evaporates out of the tray, the air surrounding the plant will be humidified!!! Use a cookie tray to make groupings of several pots together in a single tray.

Rest and Feeding

Just like people, plants need rest too. After a long season of growing new leaves, branches or perhaps flowers, plants need a break during the winter. You may notice plants that all summer had shiny new leaves will suddenly start to lose a few leaves as they days get shorter. Perhaps the leaves start to turn yellow in the middle of the plant, or maybe they simply look dull and not as happy as they did in the spring and summer.

Resist your first impulse to water more and fertilize. Plants need much less food and water during the winter in order to remain healthy. Only feed your plants when there is active growth; this pretty much eliminates the need for fertilizer during the coldest and shortest days of winter. If fertilizer is necessary, it is best to only use about half as much as the directions call for. Once spring and summer arrive, go back to full strength. NEVER feed a plant that is very dry. If the plant is dry, water it well and then feed it a couple of days later. Plants that are stressed should not be fed and if there is ever a doubt, just skip the feeding. Plants will do much better for much longer without food than with too much food.


Winter isn't really the time to be re-potting, but we can't help it when we find the perfect pot! Remember that the plant is resting during the winter and you don't want to encourage new growth when the light requirements can't be met. Don't hesitate to buy the new pot, just set the plant in the container until you can re-pot it in the spring. It is bad to have a pot that is too large. When you are shopping for a new container for your beloved plant, keep the size no more than 2” or so larger. If you love to redecorate with different colored pottery, you can always pot your plant in a cheap plastic pot that you can move from container to container without disrupting the roots. You will cut down on the mess of re-potting all the time and your plant will thank you for it!