I planted a garden six weeks ago at our home in the south Texas area. My squash plants Yellow Crookneck, Yellow straight neck, and Zucchini have done well with large dark green leaves and tons of blossoms. They are producing well with five or six small squash on several of the vines. The just don't seem to be getting very large, no where near the size of squash from the grocery store. My soil is sandy loam , I tilled enough peat moss into it where it is almost fluffy, grass and weeds pull out easily. I have fertilized lightly twice with Jobe's organic vegetable fertilizer and I water regularly. Am I missing something or just being impatient?