Greenhouse calendar - April

Greenhousecalendar April


April is known for its unpredictable weather with over 150 hours of sunshine. One day you wake up to bright sun and delightful spring warmth, and the next day it's snowing. However, the average temperature usually hovers around 6 degrees Celsius.



Greenhouse Maintenance
  • You have done your groundwork, and now it's time to focus on tasks in the greenhouse and garden.
Greenhouse Chores
  • Consider summer watering now. There are many options, from rainwater collectors to automatic irrigation systems, to assist in plant growth during spring and summer. Learn more about watering products here.
  • Adhere to the sowing depth indicated on the seed packet. Rule: Max 3 times as much soil on the seed as its size.
  • Tomatoes, peppers, and eggplants started in March can now be transplanted into 10-12 cm pots. Remember to water and consider using fertilizer. Read more about fertilizer here.
  • If you haven't started your cucumbers indoors, do it now. They should be sown 35 days before being moved to the greenhouse. So, if you sow them between April 15-20, you can transplant them between May 20-25 if the greenhouse temperature allows.
  • Monitor the soil temperature with a soil thermometer.
  • Keep an eye on the temperature in the greenhouse. On sunny days, it can get quite hot, with a temperature difference of 20-30 degrees between night and day. To provide the best growth conditions for plants without significant temperature fluctuations, it's a good idea to ventilate/keep the doors open during the day.
  • You can now pre-cultivate summer flowers and vegetables. A good tip is to wait until the soil is around 8 degrees Celsius or more to avoid frost damage.
  • Wait until the end of the month to prune delicate flowers.
  • Many bushes can be pruned now, such as cotoneaster, boxwood, hazel, hawthorn, hornbeam, common hydrangea, butterbur, and queen bush, paradise apple, and currants.
  • Trim your lavender down to 5-8 cm above the ground.
  • The butterfly bush also needs attention – trim it down to a height of about 35-40 cm above the ground.
  • Potted plants are tired of being in the same pots, so it's time to switch to larger pots with fresh soil, use potting soil.
  • If you want to get pots off the table and floor in the greenhouse, a pot holder can be a good solution.
  • Place potted plants outside on a warm rainy day to get rid of winter dust without leaving lime stains.
  • Clear your windowsills of your pre-sprouted plants. The pre-sprouted plants now need to be pricked out.
  • Remove wilted leaves and any runners on strawberry plants to prevent mold.
  • Sow new parsley so that fresh plants are ready when the old ones start to flower.
  • Annual weeds are easy to remove at this time because they appear as small plants with limited root systems. If you focus on removing weeds now, it will save you a lot of work later when the plants are no longer small.
  • Decorate the greenhouse for Easter. Scatter small Easter eggs around the garden, create Easter decorations, and decorate the greenhouse with flowers. See how Nanna and Frederik have decorated their greenhouse for Easter.
  • Utilise spring to create space in the garden. Different spaces can enhance your experience and enjoyment of the garden. Garden spaces can provide the following functions:


  1. Divide the garden into different themes, colours, or plant types, adding visual interest and variety to the garden.
  2. Small, secluded spaces in the garden can create cozy, intimate areas where you can relax and feel away from the stresses of everyday life.
  3. Different spaces can also create habitats for different wildlife. For example, a wildflower area can attract bees and butterflies, while a water area can attract birds and insects.
  4. By dividing the garden into spaces, you can better control where plants are placed. You can create areas with different light and soil conditions, allowing you to grow a wider variety of plants.

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