Getting a Head Start: Greenhouse Gardening in Late Winter

Even when the outdoor garden lies dormant under frozen ground or a blanket of snow, late winter signals the perfect time to kick off the growing season under glass. A cool greenhouse — maintained at a minimum of 4–7°C (40–45°F) with a touch of artificial heat — becomes a powerhouse for early propagation and plant care.

Sowing and Sprouting

Half-hardy annual seeds can be started in a heated propagator, while tuberous greenhouse plants are encouraged to sprout with gentle warmth. Tender annuals sown last summer or autumn are now approaching flowering and will need increased watering. This is also the moment to take the first cuttings of the year; chrysanthemums, in particular, continue to produce viable shoots for propagation. Prepare fresh compost mixes now so they're ready for spring potting.

Watering and Pruning

From mid-season onward, greenhouse watering should gradually increase. Many potted plants benefit from their annual pruning now — late winter is the traditional time to cut back a wide range of container-grown specimens, though some are better pruned immediately after flowering in autumn.

Outdoor Opportunities

If the weather allows, non-rainy days are suitable for laying turf to establish a new lawn. Established lawns can receive an occasional light topping, as they have through early winter, but prepare for mowing frequency to ramp up next month. A little outdoor planting is also possible whenever soil conditions are workable.