Provide full to part sun (4+hrs/day).

This native was collected from the Flint Hills region of the Kansas prairie. Soil type is clay to loamy clay. This plant should do well in similar soil and can tolerate rocky areas as well.

Native to hardiness zone 6b (-5 to 0 °F).

Greenthread can tolerate droughty conditions once established. During the plant’s first month, water deeply when the top 2-4 inches of soil is dry..

Greenthread does not need extensive nutrient support. If you know that your soil is poor, consider adding a small amount of compost at planting, working it evenly into the surrounding top 6-8” of soil.

If you know that your soil has acidic leanings, consider amending with lime. (Most Kansas soils don’t have this issue.)

Greenthread is what I classify as a reseeding annual in our prairie. That means that you can plant as soon as danger of frost has passed, though most natives prefer warm soil temps for best establishment.

Season-Long (May-October)

Greenthread is a reseeding annual and sometimes overwinters as a perennial. It is quite an aggressive spreader similar to black-eyed Susan and will “perennialize” in your garden. Keep that in mind when you select where to plant.

Though it looks just like coreopsis to most, greenthread’s feathery foliage is distinct. This plant doesn’t even share a genus with coreopsis though they both are housed in the same tribe in the sunflower family.