Sunflower 'Giant Mongolian'

Try to plant in a location that enjoys full sun and remember to water often. Keep in mind when planting that Giant Mongolian is thought of as half hardy, so it will need cloching or fleece protection when the temperature dips. Giant Mongolian requires a loamy and clay soil with a ph of 5.7 - 8.1 - it grows best in weakly acidic soil to weakly alkaline soil.

Look to ensure a distance 4.68 inches (12.0 cm) between seeds when sowing - bury at a depth of at least 0.49 inches (1.25 cm) deep. Soil temperature should be kept higher than 13°C / 55°F to ensure good germination.

By our calculations, you should look at sowing Giant Mongolian about 21 days before your last frost date.

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Giant Mongolian is a half hardy plant.

The botanical epithet is from the Latin annuus meaning “annual”.¹

¹ Latin Dictionary