Keep in mind when planting that Giganti di Napoli is thought of as hardy, so this plant will survive close to or on freezing temperatures. Giganti di Napoli requires a loamy and potting mix soil with a ph of 6.0 - 6.0 - it grows best in weakly acidic soil.
Try to aim for a seed spacing of at least
7.8 inches (20.0 cm) and sow at a depth of around
0.25 inches (0.64 cm). Soil temperature should be kept higher than
10°C / 50°F to ensure good germination.
By our calculations, you should look at sowing Giganti di Napoli about 35 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Giganti di Napoli is a hardy plant.