Heirloom Organic Peruano Beans. Comes with 15 beans. Sow peruano bean seeds 1 inch deep every 4 to 6 inches in the row, with 3 feet of space between rows for growing and gardening. Start peruano beans in mid-spring after the last frost of the season. Bean seeds cannot germinate at soil or air temperatures under 50 degrees F. Don't delay the start date for these beans, which require a long growing season. Water in the entire patch of newly sown bean seeds with 2 inches of water.