I am finally done with all of my seed purchases. High Mowing Organic Seeds is my favorite store to buy seeds. They obviously get the whole organic-sustainable thing, they offer a reasonable variety of seeds, and customer service (if necessary) is excellent. I buy as many seeds as I can from HMS.
This year I consulted the 2010 Ohio Vegetable Production Guide for variety recommendations. Some vegetables such as peppers sometimes struggled under the valley conditions. The guide compiles research and trail plot results across Ohio. There are a lot of other good data in this guide too, for example, do you know how to calibrate a thermometer? Read page 25, Frost Control.
This year I decided to diversify some seed purchases. I am on a quest to grow perfect orange and yellow bell peppers. In particular, all yellow hybrids I have ever grown were disappointments. The plants set few fruits and those that survived to maturity were thin walled and lost crispiness. Enter OVPG which recommends the Lafayette hybrid. Let's hope this is the hybrid that delivers the thick walled crunchy 4 lobed fruits!