Homemade "Miracle Grow": Get a clean glass or plastic jar, put a little water in it. Add egg shells and coffee grounds until it's about 3/4 full. Top it off w/water and allow to sit in a cool, dark place for about a week, gently shaking once daily. Strain and use the liquid when ready to feed plants.
Clay Pot Irrigation - a simple adaptation of an ancient technique Want to conserve water but still want to make sure you aren't under-watering your garden? Want to establish a simple greenhouse irrigation system? Clay pot irrigation can save 50-70% of water without depriving your plants.
Clay Pot Irrigation - a simple adaptation of an ancient technique
Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases. I have not tried this, but I will.
35 Pest and Disease Remedies - Fine Gardening Article
How to build a straw bale garden, this site has more information... I did it this year and I'm amazed at the size of my tomatoes! I put them around my Rhubarb patches and I was harvesting rhubarb into late September! Give this a try