This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
M. This does not want much heat to bring forward. It grows when the thermometer is well down towards the freezing point. Indeed cold frames are better than greenhouses for it. It is late to sow in October, but still we have no doubt that plants "sown in a window " would flower in spring.