Need of heat
Temperature is of great importance in plant life. Flower plants need
a certain temperature, depending on the species or variety, place of origin,
age and so on, for growth and development for the rest period. Thus, for
germination requires a certain temperature, and if it will keep after
the plants have sprouted, they will elongate or fall.
Uptake by the root system of nutrients and plant their circuit held at
a certain temperature, as sweating, breathing, flowering and other plant
For proper development of the plant is not only providing sufficient air
temperature, but soil substrate from which plants can absorb their food.
Depending on their claims against temperature, flower plants are divided
- Plants from warmer climates (tropical, subtropical), heat-loving plants;
- Plants from temperate and cold climates.
Plant origin should be well known, as even need heat germination phase
is different from plant to plant. The plants in the first category germinate
at 25 ° C, and those in the second category, 13 ° C.
At germination, rooting cuttings, buds form during pollination, seed maturation,
plants need higher temperatures, while the seedling stage after flowering
or seed storage by maintaining embryos at rest, it takes temperatures
Distinctions must consider both temperature and vegetation phases for
certain periods of the day or night, because due to the light, plants
are more active functions and therefore need higher heat, while at night,
the days of clouds or in winter (when brightness is low), photosynthesis
stops, and other functions reducing the need for heat decreases too. Temperature
variations should not never be more than 5 ° C.
Both temperatures during the day but during the night, at some plants
flower, influence their fotoperiodismul. Before removing outdoor seedlings
for planting, it takes a period of hardening, where the plants are at
a lower temperature, similar to the environment that will be planted to
increase their endurance. Also to extend the flowering period in greenhouses
need to keep a lower temperature. Too high temperatures during flowering
have a negative influence on coloring flowers (flowers are pale with dark
An imbalance occurs when seedlings grow at a very high temperature in
low light and high humidity. They elongate, and even fall sick.
Plants have their own temperature control system. Due to intense sweating
process, there is a slight cooling, provided that the soil have enough
water. Plants with shiny leaves less warm than those with hairy leaves,
as they absorb less heat radiation.
There are certain plants that withstand high temperatures: succulents,
some group euforbiaceelor ??etc.
Plants resistant to low winter temperatures: Bellis, Calendula, Convallaria,
Delphinium, Papaver, Tulipa, Viola, Hyacinthus, Iris, Lilium etc. ..
You can use various materials to protect plants against frost. For example,
a layer of leaves or straw in winter and the early frosts of autumn or
late spring can use polythene sheeting, mats, frames, glazing units etc.