Planting for wildlife
This can range from planting buddleia for butterflies and sunflowers for finches through to establishing bird baths and feeding stations. The RSPB is running their 'Home for Nature' campaign at the moment encouraging everyone to make more space for the ordinary wildlife that we used to take for granted. From hedgehogs to house sparrows, everyday wildlife is having a hard time.
Have fun
All children love playing in piles of leaves – so let them! Half the challenge is about giving children the license to enjoy playing in the garden. Playing with leaves can be a great start for younger kids (just make sure dogs haven't been near them and that hedgehogs haven't started hibernating in them.)
The fact is children love planning a project with you and then delivering it. So, whether it's a raised bed or a insect-hotel, let them choose and help them get started. Projects tend to be less season-sensitive than planting, so go ahead and get started whenever you like.