Greenhouse project, continued.

New summer is approaching, and the greenhouse project of course continues (see the previous parts of the story, starting from Part 1 onwards). The greenhouse itself, and its foundation with its freezing protection structures appear to have survived the first winter just fine, which is a good starting point. The next challenges are related to temperature and water. The dual challenges of temperature control in a small greenhouse connect to it’s small air-mass getting excessively hot in daytime, and the near-freezing temperatures affecting it to the other extreme in the night time, particularly early in the spring (or late in the autumn). The automatic ventilation of our Juliana greenhouse is based on the single roof window being opened by the gas spring when the air at the top part of the greenhouse gets hot enough. In sunny days though one ventilation window is not necessarily enough, so opening the greenhouse door as well might be necessary. Also, the sensitive young plants need to be protected from direct sunlight somehow; our solution now is based on reflective, aluminium shade fabric that mirrors enough radiation from the sun so that the temperature and light conditions are now closer to optimum.

The plans for the watering system involve the use of Blumat automated watering system and a dark plastic water tank – this will both help to keep the moisture levels good, and dark water tank will also store warmth during daytime, and release it at night, helping to balance cold nights. While our chilies will be fed by Blumat system the tomatoes will get their own, handmade plant pot/water tank system. (This is still under construction.) Temperature and hydrometer functions are provided by the outdoor Netatmo unit, which has a nice smartphone app.

Today, there were many spring tasks in the garden, and one involved moving the chilli saplings (which had overgrown their small pots) into larger pots, with some fresh soil. It would be so nice to be able to just leave the chillies into the greenhouse already, but nights in Finland in early May are just too cold – so, since we do not have a petrol or electric heater for nights, the chilli plants need to be carried indoors every night, and back in the morning, as long as the cold nights go on. Let’s see how long it takes for me to go out and get that heater…

Author: frans

Professor of Information Studies and Interactive Media, esp. Digital Culture and Game Studies in the Tampere University, Finland. Occasional photographer and gardener.

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