For dedicated gardeners, here are suggestions from the California Assn. of Nurserymen on what to do in the garden this week:
* Harvest summer vegetables often to extend production.
* Cut to 12 inches from soil level all hydrangea stalks that bloomed this year.
* Feed citrus and avocados.
* Pinch off fuchsia seed pods to extend production.
* Plant perennials during the next six weeks for bloom next spring and for years to come.