So you start your seedlings in February, near the window, then say when its a one half foot tall you place outside?

Not a bad move in theory, however, it is likely your plant will reach 6" in height in 2 weeks with window only light.

The window only light simply isn't sufficient at the end of winter to grow window sill weed. Its hours are too short and the sectrum changes from morning to evening every day thus robbing you of good Kelvin temps all day long.

You could accomplish the same thing by just planting outside in April.

By the end of the month, the outside planted plant will be far healthier and bushier than a plant grown on a windowsill in February or March.