Not all deciduous trees drop their leaves in the fall. Instead, some hang on to their dead leaves throughout the winter – a phenomenon called marcescence. No one knows exactly why this happens, but Daniel shares a few reasons why a tree might want keep hold of its crispy, brown leaves until spring.
If you grow a vegetable garden, this is the time of year you should be starting your onion seeds. Casey explains why onion seeds should be sown so early. Day length has everything to do with it.
- Penn State – Winter Leaves that Hang On
- Arnold Arboretum – Why Leaves Don’t Leave
- Awkward Botany – Onion Seed Viability, etc.