I was wondering about that. I guess some growers can put seeds directly in the ground but it sounds like they are the exception. I have the date I planted seeds indoors, then planted out in the greenhouse. That would make a difference too I would think as the greenhouse (really just hoops over my raised beds) changes the equation by changing the exposure of plants to the natural ambient temps, moisture, sunlight. But perhaps inserting variables into the formula would account for that. I tried growing them last year without the top and did get tomatoes so I have a few left over that I could put in pots in the yard uncovered. They would have a slightly different plant out date but would be purely at the whim of the natural environment.
Really interesting project. Love Excel and Access. Use it for my gardens mostly flowers. Now I will have to add a section on vegies with additional fields for such information as you have mentioned. Also as with you all our summers vary greatly. So one summer cannot be compared to another. This one seems to be going to warm and dry, while last summer was rather cool and wet.
