Keep in mind when planting that Italian Giant is thought of as hardy, so this plant will grow or become dormant during the winter. Planting Italian Giant in loamy and potting mix soil with a ph of between 5.6 and 6.0 is ideal for as it does best in weakly acidic soil.
Sow at a depth of approx.
0.25 inches (0.64 cm) and aim for a distance of at least
7.8 inches (20.0 cm) between Flat leaf parsley plants. Soil temperature should be kept higher than
10°C / 50°F to ensure good germination.
By our calculations, you should look at sowing Italian Giant about 35 days before your last frost date.
As Italian Giant is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.