I always planted peas outside on my grandmother's birthday, March 19, two days after St. Patricks Day. It works unless moles/voles/mice eat the peas. sometines I think that they mark their calendar for the start of the veggie sprout season.
I start pruning my roses when the forsythia bloom.
I heard a way to predict the severity of the oncoming winter. If the gypsy moth tents are close to the trunk of the tree, it will be a severe winter. If they are near the end of a branch, it will be a mild winter. It has been reasonably accurate the past few years.
I haven't heard of corn gluten as a weed preventative in spring. Do you buy corn gluten in the grocery store or a specialty store? I have lots of weeds and try to avoid chemical warfare.