To propagate a chokecherry, you can use methods like seed propagation by collecting seeds in late summer, cold stratifying them, and planting them in the spring;cuttings by taking semi-hardwood cuttings in early summer, dipping them in rooting hormone, and planting them in a moist potting mix;or division by separating suckers or root crowns from an established chokecherry plant in early spring

Key points to remember:

Seed propagation: Collect ripe chokecherries in late summer. 

Remove the pulp and clean the seeds.  Cold stratify the seeds in a refrigerator for 3-4 months to break dormancy.  Plant the stratified seeds in spring. 

Cuttings: Take semi-hardwood cuttings in early summer. 

Choose healthy stems around 6 inches long.  Remove the lower leaves and dip the cut end in rooting hormone.  Plant the cuttings in a moist potting mix and keep them in a humid environment. 

Division: Dig up young suckers or root crowns from around the base of an established chokecherry plant. 

Carefully separate the new plants from the parent plant, ensuring they have adequate root systems.  Plant the divisions in a new location. 

Important considerations:

Rooting hormone: Using rooting hormone can significantly improve the success rate of rooting chokecherry cuttings. 

Moisture level: Maintain consistent moisture levels throughout the propagation process. 

Light conditions: Provide adequate light for cuttings, but avoid direct scorching sunlight. 

Soil type: Choose a well-draining potting mix for rooting cuttings.