You can sow vegetable seeds every month of the year. There may be more options at certain times, but not a month goes by that vegetables cannot be planted. If you want to make a more personalized plot, there are birth month vegetable seeds to sow and grow suited to the month you were born.
Planting birth month vegetable seeds can be a fun way to introduce someone to growing vegetables. They make a unique present to enjoy planting and caring for, but also are a tasty treat as those homegrown crops will taste much better than store-bought.
