[Restoring the Land] Seeds and Seeding: What to Avoid, Part 2 - Maurice Kains

Commercial gardeners nowadays govern their spring sowing and planting largely by the weather maps and still more by the daily forecasts of the United States Weather Bureau.
Isotherms, or lines of equal temperature, serve as guides to safe seedage and planting.
For instance, the isotherm of 45° is the northern safe limit of transplanting hardy plants (cabbage and lettuce) from coldframes to the open ground; and that of 60° for tender plants (tomato and peppers).
To have plants ready on the dates when these temperatures normally arrive the seed is sown under glass 5 or 6 weeks earlier.
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