How do you know its almost September without looking at the calendar?   Look at your gardens.  Chances are you have not seriously weeded since vacation.  But the produce and flowers are rolling in.  In this week's Garden Talk:  proper knives for the harvest kitchen, how Swiss scientists say we can just plant trees to reverse global CO2 levels by 100 years, hornets are more garden friend than foe, air rooting your favorite tree, and much more.  Until next time...see you in the garden!  Len