i have 4 plants, cucumber, icebox watermelon, yellow squash and yellow bell pepper. i want to plant them in the garden but the tenant before was growing flowers, mostly lilies. we have dug them up, is it safe to grow my veggies there?

i have 4 plants, cucumber, icebox watermelon, yellow squash and yellow bell pepper. i want to plant them in the garden but the tenant before was growing flowers, mostly lilies. we have dug them up, is it safe to grow my veggies there?