Prepare broccoli and place in a mixing bowl, set aside.
Cut apple and toss in 1 tablespoon of lemon juice. Add to broccoli along with blueberries, onion, cranberries and sunflower seeds.
In a small bowl whisk together the yogurt, mayonnaise, honey, lemon juice, vinegar, salt and poppy seeds. Pour over broccoli mixture and toss gently to combine.
Cover and refrigerate. Good for a couple of days in the refrigerator.