You better make sure there are no coons around using blood meal as a top dressing, they will F up your shit pretty quick. Those little hands will rip your plants out and keep digging for the rest of your bone and blood meal!
I was Gorilla for 20 years before I came in out of the cold!
I don't know where your at but March and April might be a bit early....I use to put out June 1 and July 1 and do just fine.
Depending on your location your plants might start to flower in March and April and then go back to veg and then to flower again = a big waste of time money and energy!