Temperature For Houseplants: Comfortable Temperature For Houseplants

How a plant feels, grows and develops depends directly on air temperature3>. House plants, or rather most of them, come from the subtropics or the tropics. In other latitudes, they have to grow in greenhouses, where they create the necessary microclimate. But this does not mean that absolutely all houseplants need high air temperature.

There are very few indoor flowers, capable of proper growth and development, if the room where they are constantly kept high temperature (more than 24 degrees).

This fact is due to the fact that the conditions of our latitudes are very different from those available in their homeland. So, the humidity here is quite low, the duration of daylight is much shorter. Lighting is also less intense. Therefore, in order to create comfortable conditions for such plants, the temperature in the room should also be different from that in their homeland and should be much lower.

Special features of air temperature for house plants

The influence of temperature on the plant

Temperature for houseplants: Comfortable temperature for houseplants

The amount of heat as well as the time period during which a particular temperature has been maintained is determined for temperature measurements.

Houseplants have a certain temperature range, the maximum and minimum temperatures within which the flower feels good and develops normally.

When the room temperature is low enough, both biochemical and physiological processes slow down in this environment, namely the rate of respiration, photosynthesis, as well as the production and distribution of organic substances. If the temperature is higher than normal, these processes are accelerated.

What should the TEMPERATURE be for ROOM PLANTS

Patterns of variation (natural)

A rhythmic change in temperature occurs during the day and night. This change also takes place during the whole year and this is due to the seasons which follow each other smoothly.

And plants necessarily adapt to this process, which takes place where they grow in their natural environment. Plants of temperate latitudes calmly tolerate sharp temperature fluctuations, while those in the tropics endure them rather poorly. For most "inhabitants" of temperate latitudes, the time when the cold weather arrives is marked by the beginning of the dormancy period. This is very important for them since this period has a very positive influence on their future intensive growth and development. In a wide temperature range with a big difference between day and night, summer and winter, plants such as aloe, sansevière, ficus, clivia and aspidistre thrive.

It is important to remember that nighttime temperatures must be a couple of degrees cooler than during the day.

What is the optimum temperature

Temperature for houseplants: Comfortable temperature for houseplants

For ornamental and flowering plants which include begonia, mulberry, aroids, bromeliads and others to grow and develop properly, an air temperature of 20 to 25 degrees is needed. 18 to 20 degrees should be provided for plants belonging to the genus coleus, peperomia, sanchezia, etc. And for those whose homeland is the subtropics (Phatsia, Aucuba, Zebrina, Ivy, Tetrastigma etc.) you need a temperature between 15-18 degrees.

Pestrole plants from the tropics are the most heat-loving and include codiceum, cordilina, caladium and others.

Winter temperature and resting period

Temperature for houseplants: Comfortable temperature for houseplants

There are plants that simply need cool temperatures during the wintertime. This is because they begin their dormancy period or their growth slows down. Thus, primroses, pelargoniums, hydrangeas and cyclamen need 10-15 degrees in the winter. And rhododendron and eucalyptus feel perfectly well at 5-8 degrees.

In order that Asparagus sprenger, Scherzer anthurium and Spatifilum wallis bloom more abundantly and actively they are put in a room with a maximum temperature of 15-18 degrees during the fall (dormancy). From the beginning of January the temperature should be higher, between 20-22 degrees.

If a plant does not bloom, it is most likely due to a disturbance to their rhythm of life, or more precisely to their dormancy period.

For example, if regular watering and moderate temperatures are provided to cacti during the winter, they will have unsightly growth and no flowering. And hippeastrums will stop forming buds and their owners will only have to admire the lush foliage.

Temperature of soil

Temperature for houseplants: Comfortable temperature for houseplants

As a rule, the soil in the flower pot has a temperature that is a couple of degrees different from the indoor air. During the winter, it is very important to ensure that the root system does not become overcooled. To do this, you need to take a number of measures. First, the pot in any case should not stand very close to the glass. Secondly, put a mat of wood, cardboard, cork or plastic foam under the pot.

If there will be a supercooling, the root system is much worse to absorb moisture from the soil, which can contribute to rotting.

For example, Diffenbahia feels great when the soil temperature is 24-27 degrees. And experienced florists advise filling the trays of flowers such as ficus, gardenia and eucharis with warm water, since they simply adore warm soil.

Heat tolerance of certain plant groups

Temperature for houseplants: Comfortable temperature for houseplants

Plants that are dormant at 5-8 degrees

These plants need lower temperatures in the fall and winter and rest: laurel, fatsia, succulents, rhododendron, chlorophytum and others.

Warm-loving plants (20 to 25 degrees)

This group includes: Diffenbachia, Codium, Caladium, Disigotea, Aglaonema, Calatea, Orchid, Syngonium, Acalifa, etc.

Plants that need moderate heat (17 to 20 degrees)

This group includes clerodendron, wax ivy, sinzingia, Liviston palm, afelandra, reo, anthurium, senpolia, pandanus, monster, coconut palm, guinura, pelea and others.

Plants needing cool (10 to 16 degrees)

This includes: azalea, oleander, pelargonium, aspidistra, ficus, trudescantia, roses, fuchsia, primroses, aucuba, stonewort, ivy, cyperus, chlorophytum, araucaria, Asparagus, Dracenium, Begonia, Balzaminium, Bromeliads, Callanhoe, Coleus, Maranta, Ferns, Chevron, Philodendron, Hoya, Peperomia, Spatifilum etc.

Temperature for growing indoor plants.

The effects of heat disturbance

Serious changes in temperature

Plants are extremely negative to sudden drops in temperature of more than 6 degrees. Thus, for example, the leaves of a Diffenbahia hepatica turn yellow and wither away if the temperature drops by 10 degrees.

Goldenseal scindapsus stops growing if the temperature drops by 15°C.

Temperatures drastically change the leaves on houseplants yellow and fall off. You should therefore make sure you move the plants away from the window if you air the room during the winter.

Temperature for houseplants: Comfortable temperature for houseplants

Temperature below normal

If the temperature is below normal, the plants will not bloom for long or they may produce underdeveloped buds. The foliage becomes much darker, curls and begins to fall off.

However, succulents and cacti tolerate low temperatures quite well.

We should not forget that during the fall and winter period the temperature on a window sill will differ from the room temperature downwards by 1-5 degrees.

Temperature above normal

If the room is very hot during winter, this will have an extremely negative effect on the tropical plants. Especially if it is hotter at night than during the day. Thus, plants spend a very large amount of nutrients accumulated during the day due to photosynthesis when they breathe at night.

As a result, the plant will become exhausted, its shoots will stretch out and become very long, the old leaves will dry out and die, and the new ones will be much smaller. The leaves below, like the flowers, will begin to fade and their edges will become darker.

Temperature for houseplants: Comfortable temperature for houseplants


No plant will grow and develop normally if there is a draft. This should definitely be considered when choosing a place for them. However, there are some plants which do not mind a draught but have very few (e.

g. oleander).

Summary: Almost all houseplants need a moderate air temperature considering the requirements of the different species. And they also need a fairly cool temperature during their resting period (if they have one).


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