Here are a few topics for presentation to a garden club.

Building healthy soil. By keeping garden beds covered year round with mulch, using natural materials such as compost and shredded leaves that feed the soil..

Natural insect control (also known as integrated pest management or IPM). Using row covers as barriers to insects such as squash bugs and borers, Japanese beetles, carrot flies. Using a spray of dormant oil to smother aphids.

Watering efficiently by using soaker hoses and drip irrigation

Creating new garden beds without tilling or digging by cutting the grass or weeds low to the ground, then covering the bed-to-be with newspaper, laid in overlapping packets, covering the newspaper with mulch, .waiting for the grass or weeds to molder and then planting through the mulch and newspaper.

You can search by keywords for more information about these topics, or find more at Rodale Press, which has been publishing for five decades about organic and green gardening.