Garland One Top Electric Windowsill Seed Propagator - 10W This Garland electric heated propagator has one propagator tray. Non-thermostatic electric heating base and high dome vented lid - 38.5cm long x 24cm deep. FREE POSTAGE £21.45 This compact electric propagator is ideal for seeds and cuttings such as herbs, flowers and vegetables. Has one injection moulded growing tray and a high vented dome. Low cost propagator has a 10W heated base. Size 38.5cm (15.25") Long x 24cm (9.5") Deep x 19cm (7.5") High.