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Here is a list of sites I get a lot of my ideas from, or at least the technical aspect from. :) I will add to and update from time to time so keep checking back or bookmark this page.
The Science of Gardening:
Science Net Links
Nutrients For Life. Org
Free Lesson Plans and Ideas, General:
Teachers Pay Teachers (Just put 'FREE' in the search bar)
NeoK12 (Is not longer free but still has a lot of great FREE videos to go along with your themes.)
BrainPop and BrainPopJr have lots of free stuff to watch and do, but are also a paid site.
Free Learning game sites. Who doesn't love to learn with out knowing?
Animal Jam (National Geographic)
I am in no way affiliated with or paid by any of these websites or pages. They are just a round up of my 'go to' sources for activities and work sheets! Enjoy!