US Grow Zones

• get_zone_by_zip — Use this when the user asks what USDA plant hardiness zone (e.g. 7a) a U.S. ZIP code is in, or the average extreme winter low there. Returns the 2023 USDA zone,
• get_frost_dates — Use this when the user asks for the average last spring frost, first fall frost, or growing season length for a U.S. ZIP code (or a city + state). Returns NOAA
• get_planting_calendar — Use this when the user asks when to start seeds indoors, transplant, direct sow or plant a fall crop for vegetables at a U.S. ZIP code. Optionally pass one crop
• what_to_plant_now — Use this when the user asks what vegetables they can plant or start now (or on a given date) at a U.S. ZIP code. Returns crops whose planting window is open, pl

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