What should I fill my raised garden bed with to ensure optimal growth and sustainability? Should I consider a myriad of organic options, or perhaps investigate the merits of utilizing a specific soil blend? As I contemplate the best materials, is it advantageous to incorporate compost, which is known for enriching the soil and enhancing its nutrient profile? Or would it be more prudent to explore the benefits of specific types of mulch that not only help with moisture retention but also suppress pesky weeds? Is there value in mixing various components, such as topsoil and peat moss, to achieve that coveted loamy texture? Furthermore, how do factors such as drainage and aeration play a role in the selection process? Could the choice of filling ultimately influence plant vitality and yield? Are there particular considerations for different types of plants, be it vegetables, herbs, or flowers, that I should keep in mind when making my decision?