Dig In: Garden checklist for week of March 15

Get ready for a rapid warm-up. The last days of winter will likely record the highest March temperatures Sacramento has ever seen.

According to the National Weather Service, Sacramento can expect a string of 90-degree days starting Tuesday, St. Patrick’s Day. We’ll stay in the 90s the rest of the week – including a predicted 94 degrees on Friday, March 20 – the first day of spring. Sacramento’s all-time high for March: 88 degrees.

Records will fall, says the weather service. These afternoon temperatures are running more than 20 degrees above normal; average high for this week is 65 degrees.

Overnight lows will be on the warm side, too, with most nights dipping into the 50s but not lower. Average low for this week: 44 degrees.

Despite this record heat, hold off on planting tomatoes and other warm-weather crops. Soil temperature hasn’t caught up with this hot air.

Enjoy these sunny days and show your garden some TLC. Don’t forget to water.

* Weed, weed, weed! Get them before they flower. Take a hoe and whack them at the base.

* Prepare vegetable beds for summer favorites. Spade in compost and other amendments.

* In the vegetable garden, transplant lettuce. Last chance this spring to transplant cole family plants such as broccoli, collards and kale. 

* Seed chard and beets directly into the ground. Soak beet seeds before planting to aid germination.

* Harvest fall-planted lettuce and cabbage before it “bolts” – sending out flower shoots.

* Fertilize roses, annual flowers and berries as spring growth begins to appear.

* Prune and fertilize spring-flowering shrubs after bloom.

* Feed camellias at the end of their bloom cycle. Pick up browned and fallen flowers to help corral blossom blight.

* Feed citrus trees, which are now in bloom and setting fruit. To prevent sunburn and borer problems on young trees, paint the exposed portion of the trunk with diluted white latex (water-based) interior paint. Dilute the paint with an equal amount of cold water before application.

* Feed roses with a balanced fertilizer (such as 10-10-10 or 4-4-4, the ratio of nitrogen, phosphorus and potassium available in that product).

* Prune and fertilize spring-flowering shrubs and trees after they bloom. Try using well-composted manure, spread 1-inch-thick under the tree. This serves as both fertilizer and mulch, retaining moisture while cutting down on weeds.

* Cut back and fertilize perennial herbs to encourage new growth.

* Plant summer bulbs, including gladiolus, tuberous begonias and callas. Also plant dahlia tubers.

* Shop for perennials. Many varieties are available in local nurseries and at plant events. They can be transplanted now while the weather remains relatively cool.

* Seed and renovate the lawn, if you have one. Feed cool-season grasses such as bent, blue, rye and fescue with a slow-release fertilizer. Check the irrigation system and perform maintenance. Make sure sprinkler heads are turned toward the lawn, not the sidewalk.