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In this episode of Talking Trees, we explore the 10-20-30 Rule, a widely recognized guideline for enhancing tree species diversity in urban forests. Originally proposed by Frank Santamour, this rule suggests that:

• No more than 10% of trees should belong to the same species.
• No more than 20% should come from the same genus.
• No more than 30% should be from the same family.

The goal of this rule is to prevent catastrophic tree loss due to pests and diseases, promoting a resilient and sustainable urban tree population.

We discuss:

• The benefits of species diversity in preventing outbreaks of invasive pests like the emerald ash borer and Dutch elm disease.
• Challenges in implementing the rule, particularly in regions with harsh climates or limited species options.
• Alternative strategies, such as refining diversity guidelines based on local ecosystems, climate adaptability, and urban planning constraints.

Join us as we examine the scientific basis, practical applications, and future adaptations of the 10-20-30 Rule in modern urban forestry and tree planting strategies.

Background information:

• Hot Take Santamour's 10 20 30
• The 10-20-30 Rule For Tree Diversity, A look at the long-standing urban forestry rule of thumb, January 24,2024 | Alec Sabatini
• Green space management: 10-20-30 rule by Santamour as a compass Ebben tree nursery 10-20-30 rule trees in Delft

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