It is about 4 ft tall and I have no idea what it is can anyone help me?
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As @NiallC guessed, this is Caper Spurge, Euphorbia lathyris, an invasive weed in many areas. I thought it was an annual, but apparently this is a biennial plant. It will grow in zones 5-9. All parts of the plant are poisonous, and handling may cause skin irritations. Care must be taken during removal. It should pull out fairly easily, but you can dig it out if your soil is hard and/or rocky. If the plant has mature seeds, do not add to a composting system unless it is very hot.