For dedicated gardeners, here are suggestions...

For dedicated gardeners, here are suggestions from the California Assn. of Nurserymen on what to do in the garden this week:

* Take the lawn mower in for an annual checkup and sharpen the blades at the same time.

* Use a 3- to 4-inch layer of mulch around shrubs and trees to reduce the need for frequent waterings. Mulching also retards weed growth.

* Check birch, maple and ash trees for aphids. Spraying now will avoid the sticky drip later.

* Remove faded flowers from annuals to encourage repeat blooming through the summer.

* Apply chelated iron to citrus, azaleas and gardenias to avoid yellow leaves.