Rinse the spring mix salad greens under cool water and pat dry.
Remove the green tops from strawberries and slice them into quarters or thin slices.
Cut the avocado in half, remove the pit, scoop out the flesh, and dice it into small cubes.
In a large mixing bowl, combine the salad greens, sliced strawberries, diced avocado, crumbled feta cheese, and chopped pecans. Toss gently.
Whisk together olive oil, balsamic vinegar, honey, poppy seeds, salt, and pepper in a small bowl until well combined.
Drizzle the dressing over the salad mixture and toss gently until coated.
Serve immediately after tossing to enjoy at its freshest.