Quick Answer
A diverse food forest benefits from a mix of deciduous and evergreen trees, including fruit trees like apple, pear, and fig, nut trees like walnut and hazelnut, and nitrogen-fixing trees like alder and acacia.
Choosing the Right Trees
When selecting trees for a food forest, consider the climate, soil conditions, and desired harvest seasons. For a temperate climate, aim for a mix of 30-50% deciduous trees, 20-30% evergreen trees, and 20-30% nitrogen-fixing trees. For example, plant 3-4 fruit trees like apple (Malus domestica) or pear (Pyrus communis) every 20-25 feet, spaced 15-20 feet apart.
Plant Spacing and Interplanting
To maximize space and diversity, interplant smaller trees like fig (Ficus carica) and dwarf citrus (Citrus spp.) among larger trees. Plant nitrogen-fixing trees like alder (Alnus glutinosa) or acacia (Acacia spp.) at a closer spacing of 10-15 feet to take advantage of their soil-enriching abilities. Consider a 3x3 or 4x4 tree spacing pattern to create a diverse canopy and promote beneficial relationships between trees.
Designing a Functional Food Forest
When designing a food forest, consider the mature size of each tree and leave enough space for maintenance and access. Remove any dead or diseased trees to maintain a healthy and productive ecosystem. Consider using a trellis or espalier system for climbing plants like kiwi (Actinidia deliciosa) or grape (Vitis spp.) to maximize space and flavor.
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