Try to aim for a seed spacing of at least
3.96 feet (1.22 metres) and sow at a depth of around
0.25 inches (0.64 cm).
By our calculations, you should look at sowing Charles Rennie Mackintosh about 35 days before your last frost date.
Charles Rennie Mackintosh is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.