Weed-free way to grow lettuce, spinach.. Take a 2 cubic feet bag of potting soil, loosen the soil, poke holes in the back side for drainage and cut out the top, leaving about a 4 or 5 inch border,then sprinkle the seeds around. When harvesting, just use a pair of scissors and cut what you need - don't pull the plants out. Same goes for spinach - they will grow back almost magically overnight, and you can't tell where you cut. Spray mist seeds at first then later water as usual.
Avocado Plant ~ Take the avocado pit and push the flat end into a six-inch pot of moist, multi-purpose soil. Leave the pointy end exposed. Keep the plant at about 65° F until the first leaf shoots appear. Aftet that, it likes normal room temperatures. To encourage upward growth, pinch off new buds when they appear below the top leaves on the plant stalk. With proper care, in three years your Avocado will grow to an elegant, large-leaved houseplant about 3 feet tall.