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Key lime is hardy only in zones 10-11, with protection in zone 9, but they're easy to grow if you know these tips.
Baking soda neutralizes the ph in the soil and nothing will grow there. use baking soda around all of the edges of flower beds to keep the grass and weeds from growing into beds. Just sprinkle it onto the soil so that it covers it lightly. Do this twice a year - spring and fall.