How about:
- Plants I can't grow no matter how many times I try (but I want to grow them!)
- Plants I am proudest of
- My Plants most resistant to ... (deer, slugs, drought, wind, clay, sand, insects ...)
- Flowers to start indoors 8-12 weeks before last frost
- Flowers to start indoors 6-8 weeks before last frost
- Flowers and Vegetables to start indoors 2-4 weeks before last frost
- Flowers to Wintersow in January
- Flowers to "Wintersow" in early Spring