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In Zone 10, you can plantIn Zone 10, you can plant beans as early as February into April. Another batch can be planted in August and September. Scarlet runner beans can be grown as perennials in Zone 10. Beans like about an inch of water per week. Many diseases occur if the soil gets waterlogged, or the air is very humid, which I'm guessing your winters might not experience. You might ask your county's Cooperative Extension about care for runner beans in your area; there might also be varieties best for your climate. See:

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