The next step before the last threat of freeze if finally over around Mid May - Zone 5 - is to figure out a good Organic pest and fungus strategy.
Found this on Instructable -
This instructable will teach you how to make an all-in-one pesticide and fungicide spray that works great for indoor and outdoor plants. My boyfriend recently got into the IPM (integrated pest management) approach to gardening, so he's been spending a good amount of time learning about natural ways to combat pests and fungus on our plants and I've been learning along with him!
If you're looking to learn about IPM and other foliar sprays you can make, I highly recommend checking out BuildASoil - they have an amazing blog and store and offer fantastic phone support for any problems you run into. My boyfriend's spent a good deal of time on the phone getting advice from them - they're always top notch!
This foliar spray utilizes neem oil, potassium silicate, aloe vera and various essential oils to combat many types of pests and fungi. It can be applied once a week to control any issues that come up with your garden!
The amount of foliar spray this recipe makes should be able to completely saturate at least three large plants - we used it on two three foot tall trees (avocado and lemon) and a few succulents.