A mature shrub may reach 4-6 feet hight. Blooms are seen from late spring through fall. The double purple is extremly fragant, especially in the evening hours. May sport 100-200 flowers simultaneously - an extremely dramatic display. The devil's trumpet is self seeding. In climates zone 1-7 where it's not hardy, start in fall to plant your seeds for next spring. Plant in full sun to partial shade in most soils. Provide some wind protection so as not to spoil the flowers. This shrub is best planted as a free standing specimen to show off the blooms without crowding from other plants. Water to establish, then the devil's trumpet is normally carefree. Protect from frost to be sure of success. This devil trumpet is a double bloom, purple trumpet in purple trumpet. Blooms are 12.
All parts of this plant are toxic, if ingested.
Soaking the seeds overnight in hand-hot water is often beneficial. Sow the seeds in a good soil mix, and barely cover them with soil. Mist the soil heavily, and cover the container with a clear plastic dome. (A sheet of clear plastic will work, but an actual dome is better. Place the seed tray in good light, and if bottom heat is available it will be helpful. Check often, to be certain that your soil doesn't dry out. If there's condensation on your dome, it's plenty wet. Don't water again until this clears up, because too-wet seeds can rot or develope fungal diseases.