My fiance and I garden, and the one aspect that pays HUGE rewards financially is the herb garden. Fresh herbs are expensive, and dried ones aren't exactly cheap. But they make food taste so much better. We grow thyme, basil, oregano, dill, parsley, rosemary, sage, mint, and cilantro, and they're all easy to care for. We use them fresh, but also dry them for use year-round. Some seasoning mixes for you:
"Italian seasonings" is primarily oregano, basil, and a little bit of thyme and sage, sometimes with dried onion and garlic added. Make your own with the exact ratios you prefer.
Seasoning to mix with olive oil for bread-dipping: oregano, basil, thyme, rosemary, garlic, salt, black pepper.
Soup seasoning base: onion, garlic, sage, thyme, basil, parsley, oregano, rosemary, salt, black pepper, cayenne pepper (lots of onion & garlic; light on the rosemary & cayenne). Adjust ratios for different styles: for bean soup, more cayenne and add cilantro and cumin; for Italian minestrone, more oregano and basil.