Build a mini greenhouse yourself: 4 ideas for a DIY indoor greenhouse

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Many gardening enthusiasts no longer want to buy the young plants for tomatoes, cucumbers or lettuce in the garden market, but rather grow their vegetables themselves from seeds. With an indoor greenhouse, vegetables can be grown well on the windowsill before you go out into nature or a large greenhouse.

Benefits of DIY mini greenhouse

Many vegetables require a lot of light and heat to develop from a seed into a small plant. Greenhouses often offer these necessary conditions and with a small greenhouse on the window sill you have a protected area for tomatoes, cucumbers and the like. Always in sight.
  • can be adapted to the required requirements
  • is quickly tinkered
  • interesting upcycling project
  • Garbage can be used creatively
  • hardly any material costs
  • is light and mobile
  • growing up sheltered from the wind
  • good supply of light
After pricking and before hardening, tomatoes must first develop and grow well. With a small greenhouse you can always watch the plants grow on the windowsill in the nursery, the kitchen or from the workplace.

You can also make friends, family and acquaintances happy as a small gift.
From cress and vegetables to flowers and succulents, almost all plants can be kept in such a greenhouse, at least for a certain period of time.

What do you have to consider with a mini greenhouse?

1. UV-impermeable PE film is best, so the plants get enough light and are protected from wind and rain (if mine puts its little greenhouse on the balcony). That is why cling film is often used for such small projects.

2. When filling a small greenhouse, you also have to make sure that there is no waterlogging. So here, too, a drainage layer made of small stones, under the potting soil, is advisable -

at least if the excess irrigation water cannot run off any other way.

3. A greenhouse for the window sill also needs to be ventilated regularly, otherwise condensation water is a very suitable trigger for mold growth.

Instructions for the mini greenhouse

It is best to take a look at all of our instructions for a greenhouse beforehand and then choose the one that suits you best.
  • How much space do I have available?
  • How big does my mini greenhouse have to be for the plant to do well?
  • What materials are available to me?
  • What do I trust with craftsmanship?
Note: In all instructions you will only find the materials for the construction of the greenhouse, since different plants also need different soil, planting etc. covered in detail by us in other articles.

Egg packaging

Mini greenhouse - egg packaging DIYYou need:
  • Egg packaging (for at least 4 eggs)
  • Shish kebab skewers made of wood
  • Cling film
  • mandatory: modeling clay / modeling clay / fimo or similar
  • scissors
Step 1
First cut off the lid and the closure (be sure to keep it!) Of the packaging.
step 2
Pierce the wooden skewers from below, in a cross between the individual egg hollows, through the egg carton. Push the skewers through until they touch the ground.
Tip: With a little dough you can fix the kebab skewer in the egg packaging. This stabilizes the skewers and protects them from slipping out.
step 3
Now put the closed flap onto the skewers from above. The cardboard serves as the "roof prince" and thus marks the highest point of your indoor greenhouse. With a small ball of modeling clay underneath the cardboard (around the skewer) you can protect the upper part from slipping.
Step 4
Starting at the bottom, wrap the cling film once around the egg pack - high above the prince - back down to the other side.
Tip: With clothespins you can easily fix the film in a few places and open it again for airing and watering.

Food packaging - tray

Mini greenhouse packaging DIYyou need
  • 2 plastic food packaging - trays (e.g. B. for mushrooms)
  • Adhesive tape or parcel tape, preferably transparent
  • Wooden ice cream stick or skewer
  • Scissors or cutter
Step 1
Place both bowls next to each other and tape a strip of duct tape over the touching edges.

step 2

Close the resulting box and put strips of adhesive tape on the back again, these are used for stabilization.

step 3

In order to be able to ventilate your small greenhouse well, it is advisable to cut a small wooden stick to the right size. Either use a popsicle stick or a wooden shashlik stick shortened to the right length.
Tip: If you only have one shell available, you can cover it with cling film - as a roof. The foil can be easily attached to the edge with a few clothespins. To prevent the greenhouse from sweating, holes should be made in the film and ventilated regularly.

Pet bottle

Mini Greenhouse - PET Bottle DIYyou need
  • empty and cleaned PET bottle without label
  • Scissors or craft knife
Step 1
Carefully cut off the bottom of the plastic bottle and de-grade the edge so that no sharp corners or edges remain as a source of danger.
step 2
Place the bottle in the soil over the plant to be protected.
Tip: Make a few small holes in the lid so the plant doesn't work up a sweat in the greenhouse.

CD cases

Old, transparent CD cases can also be used to make very stable mini greenhouses very quickly and easily. We use "normal" CD cases for our instructions, not slim cases or double CD cases.
option A
For the simplest version you only need 2 CD sleeves and some adhesive tape.
Step 1
Carefully remove the (usually black) CD holder from the Wednesday.
step 2
Place the two covers (opened at a 90 degree angle) next to each other so that they form a square. You can fix the corners either with adhesive tape or with hot glue or Fix the superglue.
step 3
You can either use another transparent CD cover half as a roof - this would then have to be used Fastened with an "adhesive tape hinge" like in a greenhouse from a food package will. Or you can simply use some cling film with a few air holes as a roof for your little DIY greenhouse.
Variant B
Mini greenhouse made from CD case - DIYThis variant of a CD greenhouse is a little more complex, but a lot more stable and, above all, infinitely extendable. Due to its stable construction, this mini greenhouse is also well suited for the balcony.
At least 4 CD sleeves are required for this.
Step 1
Carefully (!) Disassemble the CD case into its three components. Be careful not to break any parts and use as little pressure and force as necessary.
step 2
Put the middle part with the CD holder aside and use the two outer parts of the CD packaging.
The front flap is simply rotated 180 degrees and placed back on the. This is done somewhat offset. The flap should click into place easily. can then not be moved much.
If the two clips protrude on one side, the cover is in the right place.
step 3
When you have rebuilt all (at least) 4 covers in this way, you can now click the many components into each other. Make sure that the resulting openings point inwards.
This creates a stable square that is similar to double glazing. As a result, this greenhouse is very stable and can also store the heat better.
Tip: You can also use longer resp. Make wider greenhouses with these building blocks. If you build several modules, they can be stacked on top of each other with a little glue. So you can let the mini greenhouse grow with the plants.

Step 4
As a roof you can use cling film or with a little more handicraft effort you can also make a hinged roof out of CD sleeves.
Mini greenhouse made of CD sleeves
We hope that one of our instructions has convinced you and that you will also become a fan of “urban gardening”. Use a mini greenhouse either as a small alternative to the garden for the balcony or for growing tomatoes, cucumbers and lettuce on the windowsill.