Prep: Wash and dry the greens, strawberries, and blueberries; slice the strawberries; crumble the feta from a block.
In a dry skillet over medium heat, toast the pecans for 4–5 minutes, stirring constantly until lightly golden and fragrant; remove from heat and let cool.
In a small bowl, whisk together balsamic vinegar, olive oil, lemon juice, dried oregano, and salt until smooth.
In a large salad bowl, add the spring greens and drizzle with the vinaigrette; toss gently until coated.
Top the greens with sliced strawberries, blueberries, toasted pecans, and crumbled feta.
Drizzle balsamic glaze over the top just before serving.
Serve immediately with optional lime wedges.