Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Schwellenburg is thought of as hardy, so Schwellenburg will tend to go dormant or grow slowly over the winter months. Schwellenburg requires a loamy and clay soil with a ph of 6.0 - 8.0 - it grows best in weakly acidic soil to weakly alkaline soil.
Growing Schwellenburg from seed
By our calculations, you should look at sowing Schwellenburg about 84 days before your last frost date.
Transplanting Schwellenburg
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Schwellenburg is a hardy plant.