Planted some Lilly Miller seeds a couple of weeks ago, this is what they look like now. Apparently they don't mind growing in sand. I added a little garden soil and organic compost to the rows as I was planting. Hopefully I have enough time here before the first frost to see a few large Jack O' Lanterns!
How they look today 9/12/2015:
You should continue to add organic compost and cow manure underneath the plants in the direction that they are growing.