By our calculations, you should look at sowing Beth alpha about 14 days after your last frost date.
They do well on a trellis but you can grow them on the ground also. Set out transplants or direct seed three feet apart (3-5 seeds per hill, thin to three best plants) with rows five to six feet apart.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Beth alpha is a tender plant.