Buckthorn ( Rhamnus spp. (notably Rhamnus cathartica)

Sun Needs:

• Full sun to partial shade
• Tolerates a wide range of light conditions
• Grows aggressively in both open and shaded areas

Bloom Time:

• Late spring to early summer
• Small, yellow-green flowers
• Inconspicuous but attract pollinators

Size:

Height: 6 to 25 feet (depending on species and growing conditions)
Width: 3 to 15 feet

Attributes:

• Dense foliage and branching structure
• Produces small black berries in late summer to fall
• Berries are mildly toxic to humans but eaten by birds
• Fast-growing and tolerant of poor soils

Care Tips:

• Plant only non-invasive or native alternatives where possible
• Prefers well-drained soil but tolerates a range of conditions
• Prune to control shape and spread
• Monitor for aggressive spreading and remove seedlings

Pest watch:

• Generally pest-resistant

Important Note: Rhamnus cathartica and Frangula alnus are invasive in many U.S. states and Canada. Check with local extension services or native plant societies before planting. Consider alternatives like native viburnums, serviceberry, or dogwood.