Perennials & Ornamental Grasses

Indoor greenhouse - function, advantages and disadvantages


How does a room greenhouse work, what are the advantages of the mini greenhouse and which plants can be used for growing?

© Niklas / Many gardeners are involved in growing plants on the windowsill. This means that you can enjoy well-developed vegetables and summer flowers early on. In addition, it is exciting to be able to observe the seedling growth up close. In order to create optimal conditions, the use of an indoor greenhouse is recommended. In the following, we explain how to use this practical growing aid and name the advantages of indoor greenhouses.

How does an indoor greenhouse work?

These small mini greenhouses have the task of stimulating the seeds to grow, even if the climatic conditions would not normally make this possible. For example, indoor greenhouses are already set up when winter temperatures are still outside and there is only a few hours of sunlight.

Growing in the indoor greenhouse succeeds because there is a special microclimate. The growing aid is set up in a bright window seat or can be placed in the heated winter garden.

What can be cultivated in the indoor greenhouse?

Depending on the size and nature of the mini greenhouse, a wide variety of plants can be grown there. While even orchids and carnivorous plants can be cultivated in comfortably furnished indoor greenhouses, conventional mini greenhouses are mostly used to pre-cultivate the following plants: cucumbers

Growing in the indoor greenhouse - step by step

  1. Fill the cultivation box with soil
  2. Spread the seeds on the substrate
  3. Cover seeds with soil
  4. Lightly press on the earth
  5. Moisten the substrate
  1. Cover the growing box
  2. Set up the cultivation box bright and warm
  3. Wait for germination
  4. Separate seedlings into peat pots
  1. For growing from seeds, about three-quarters of the indoor greenhouse is filled with special growing soil. The substrate contains the optimal nutrient composition and promotes germination.
  2. The seeds are distributed evenly on the earth. This is achieved if the seed bag is moved over the substrate with gentle shaking movements. So that the seedlings do not interfere with each other during germination, it is important to distribute the seeds as evenly as possible in the entire growing box.
  3. The seeds are covered with a thin layer of earth. It is advantageous if the substrate is screened over the seeds.
  4. " Tip: If there are light germs, no soil is distributed over the seeds. These are only slightly pressed into the substrate.

  5. The substrate is pressed lightly with your hands, a piece of wood or a small shovel.
  6. The seeds must now be watered. Use a plant sprayer to prevent the seeds from being washed out of the ground again. This allows the soil to be moistened evenly without changing the position of the seed.
  7. When the seeds have been prepared so far, the cover is placed on the indoor greenhouse. Most indoor greenhouses have ventilation flaps in the lid. If these are closed, the microclimate already mentioned arises inside, which promotes germination.
  8. " Tip: The ventilation flaps must be opened regularly so that mold does not develop in the growing box.

  9. A bright stand must be found for the indoor greenhouse. The seeds are supplied with sufficient heat and brightness on the windowsill above the heater.
  10. Germination begins after a few days. About two weeks later, it is time to prick the seedlings. For this purpose, the seedlings are carefully removed from the substrate and placed separately in small peat pots.
  11. The rest of the growing soil is removed from the indoor greenhouse. Now you can place the plant pots there again, spray them with water and continue cultivating until the plants move outdoors in spring.

What types of indoor greenhouses are there?

The selection of indoor greenhouses is large. The right growing set can be found for every space requirement and for every budget. The simplest and cheapest models are made of plastic, see the bestseller on Amazon.

1 ROMBERG 74338 Indoor greenhouse 38x25x19 cm with… 225 reviews13,95 €To the shop
If the optics are irrelevant and the practical purpose alone, these small greenhouses are sufficient. If you want aesthetics, you may choose a mini greenhouse made of wood, glass or metal.

Indoor greenhouses in the higher price segment can be heated. A heating mat under the floor pan ensures consistently high temperatures. The temperature can be controlled by a thermostat.

Some mini greenhouses also contain a lamp. Since the cultivation takes place in the low-light period, additional lighting can escape the claim of the seedlings. They need at least eight hours of sun a day to develop well.

Indoor greenhouse XXL

Indoor greenhouses can not only be used for growing plants, but are also suitable for the long-term cultivation of exotic plants. These are special models, which differ significantly in price, shape and equipment from the simple cultivation box.

The fully automatic terrariums are also suitable for the cultivation of several plants. The light and humidification are controlled fully automatically. An activated carbon filter ensures clean air conditions.

The cultivation of orchids is particularly exciting. These come in around 30,000 species and some of the exotic beauties can only be cultivated in our latitudes in the greenhouse.

" Tip: If you are limited to mini orchids, you can arrange several plants in a small space in the indoor greenhouse.

Indoor greenhouse - advantages and disadvantages

If you own a room greenhouse, you can start growing if there is still ice and snow in front of the window and gardening is still a long way off.

Young plants cultivated in the cultivation box are healthy and strong. They are larger and bloom earlier than the representatives sown outdoors.

+ optimal climatic conditions- requires space on the windowsill
+ early cultivation possible- Cultivation should be monitored
+ weather-independent cultivation- must be ventilated regularly
+ Pest infestation excluded- Purchase price for comfortable models
+ Plant observation possible at any time
+ easy cultivation
+ Ventilation can be regulated
+ Heating by heating mats possible

Correct handling of the indoor greenhouse

© Petra Schuelle / Indoor greenhouses need a bright location. The seedlings should get as much daylight as possible.

" Attention: A room greenhouse must not be set up in the blazing midday sun.

Intensive solar radiation can cause the air in the nursery box to heat up so that the small plants literally burn.

The regulation of the moisture balance in the growing vessel requires constant monitoring. The indoor greenhouse should be ventilated daily for at least two hours. The small ventilation chambers are often not sufficient for this. The entire cover must therefore be lifted off so that a lively exchange of air can take place.

We have already spoken of the advantages of heating for the mini greenhouse. But not all plants benefit from heating mats and a constant high temperature.

The required germ temperatures are different. While high temperatures are beneficial for cucumbers, tomatoes or peppers, Christmas rose or gentian need a low temperature.

In order for plants to grow, they need sufficient light, at least 1,000 lux. This equals the brightness on a cloudy autumn day. Far more brightness is required to grow plants. If the indoor greenhouse is additionally illuminated, this ensures healthy growth in the low-light season and you get vigorous young plants.