Will grow best in a slightly acidic, moist soil high in organic matter and which is well drained. Plant anytime the soil can be worked. Soil should be tilled deeply before planting. Well-rooted manure or compost can be added to the soil. The hole should be big enough to accommodate the root system without crowding. Early spring is the time to transplant or divide this plants or after flowering. Can be divided every three to four years.2
Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Purple de Oro is thought of as hardy, so this plant will grow or become dormant during the winter. A soil ph of between 6.0 and 7.0 is ideal for Purple de Oro as it does best in weakly acidic soil - neutral soil.By our calculations, you should look at sowing Purple de Oro about 42 days before your last frost date.
Similar to Stella D’Oro but reddish purple with yellow throat.1
Purple D’Oro
1 Missouri Botanical Garden
fn2: http://www.extension.umn.edu/