Greenhouse calendar - September

Greenhousecalendar September



We are now in September, and the colours in the garden are starting to change.

We are also experiencing temperature drops, with an average temperature of 13 degrees and significantly fewer hours of sunshine than in the past couple of months. It is becoming rainier, but the sun still surprises us with lovely summer weather.

Greenhouse Maintenance:
  • Go through the entire exterior of the greenhouse, including the roof and walls, to inspect for any damages, cracks, or holes.
  • Clean glass or polycarbonate panels to remove dirt and algae that may limit the light penetration. Use a soft brush and greenhouse cleaner to avoid scratches.
  • If you find damaged glass sections, replace them as soon as possible to avoid the risk of further damage to the greenhouse.
  • Check all screws and bolts and tighten if necessary.
  • Lubricate all moving parts, such as hinges and locks on doors and windows, to ensure they operate smoothly and do not get stuck during the winter.
Greenhouse Chores:
  • In early September, you can sow several batches of head lettuce – make sure to choose a variety suitable for greenhouse cultivation in the fall (winter lettuce). Also, sow corn salad and arugula.
  • September is a good time to sow or plant crops that thrive in cooler weather, such as lettuce, spinach, and cabbage. Also, consider planting onions and garlic for harvest next year.
  • Carefully inspect all plants in the greenhouse for pests.
  • Plant flower bulbs in solid beds, pots, containers, etc.
  • If there are traces of slug attacks, you can trap them by burying a container with beer.
  • Pay special attention to surviving aphids – eradicate them consistently.
  • Move the southern fruits that have enjoyed the summer outdoors into the greenhouse before the blackbirds benefit from them. Check them for pests.
  • Get the most out of your tomato plants by cutting off the tomato vines when growth stops. Hang them in a bright window for ripening if there's a risk they won't ripen outdoors or in the greenhouse.
  • Top the tomato plants, which will alter the hormone balance in the plant, resulting in faster ripening.
  • Remove dead plants, spent crops, and other plant material to minimize the risk of pests and diseases. Clean and disinfect surfaces, shelves, and tools.
  • Even though its getting cooler, good ventilation is still important to prevent moisture buildup and mold. Open windows or ventilation flaps on warm days to ensure proper air circulation.
  • Start planning which plants will overwinter in the greenhouse. Some plants may need to be moved indoors or require special protection against frost.
Garden Tips:            
  • Remove moss from the lawn using a rake or verticutter. Tip: apply lime in the spring – it helps against moss.
  • Thin out and shape-prune the evergreen trees and bushes.
  • Cut the branches off the raspberry bush right down to the ground as soon as the last raspberries are picked. This way, you can avoid grey mold and other fungal diseases on the new shoots. Pay attention to whether fruiting is on 1st or 2nd-year shoots.

Fall is approaching, and the plants may be replaced with furniture and other furnishings for leisure. You can arrange the greenhouse with shelves and tables when you aim to extend the season or contemplate how the greenhouse should look for the upcoming greenhouse season.


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