Keep in mind when planting that Joanna Reed is thought of as hardy, so this plant will survive close to or on freezing temperatures. A soil ph of between 6.1 and 7.8 is ideal for Joanna Reed as it does best in weakly acidic soil - weakly alkaline soil.
Try to aim for a seed spacing of at least
0.98 inches (2.5 cm) and sow at a depth of around
0.23 inches (0.6 cm).
By our calculations, you should look at sowing Joanna Reed about 8 days before your last frost date.
As Joanna Reed is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.