An unheated propagator is used to create a protected growing environment for seeds, cuttings and young plants. The clear lid helps retain warmth and humidity around the growing tray, making it easier to start seedlings indoors, on a windowsill, in a greenhouse or in a conservatory.
No, unheated propagators do not need electricity. They rely on natural warmth, light and the humidity created inside the propagator lid. This makes them a simple, low-cost option for seed sowing, especially when growing in a reasonably warm indoor space or greenhouse.
Yes, unheated propagators are ideal for starting many common seeds, including vegetables, herbs, flowers and houseplants. They help protect seedlings from draughts and drying out, while creating a more stable environment than an open seed tray.
An unheated propagator should be placed somewhere bright, sheltered and reasonably warm, such as a windowsill, greenhouse bench or conservatory. Avoid placing it in harsh direct sun for long periods, as the temperature inside the lid can rise quickly and may damage young seedlings.
The lid can usually be removed once seeds have germinated and the seedlings are growing strongly. It is best to ventilate the propagator gradually first, allowing the young plants to adjust to normal air conditions before moving them on or potting them up.