Renee's' Garden is an online seed company based in Northern California. There is a wealth of gardening information on the RESOURCES page. The link above will take you to an article titled 6 Dos And 1 Don't For A Good Garden -- excellent guiding principles for a successful gardening experience and an abundant harvest.
http://www.ucanr.org/blogs/blogcore/postdetail.cfm?postnum=20498
While we have experienced some warm days, we must not rush into planting summer crops just yet. Cold temperatures cause warm weather crops to stress, weakening their immune system, leaving plants more susceptible to disease and low productivity. Most articles reference "last frost date," a marker that is not applicable to our planting zone. Night time temperatures may be a better guide for when to start planting summer crops. UC Master Gardener Program blog offers some points to consider before planting summer vegetables in the garden.
https://cafarmandgarden.com/warm-season-crops/?ref=site
This article by California Farm and Garden is based in San Diego. Much of what is said is applicable to our area since San Diego is in the same planting zone (Zone 10). There is a list of warm weather crops with suggested months to plant in the garden. As mentioned, you may want to start summer crop seedlings ahead of time to gain growing time.
If you would like a visual, scroll all the way down to the end for a colorful chart on when to plant and harvest common vegetables.
Most savory recipes include onions, and homegrown onions give your dish that extra complex flavor and aroma. Onions are easy to grow if you know a few basic tips, and you need to know what type of onions to grow in your area.
Onions are a cool-season crop, meaning they like to grow in the cooler months of the year. Short-day onion varieties bulb well with 10 to 12 hours of daylight, and are best suited to being grown from late fall through late spring in Southern California.
Along with timing, there are different methods to getting your onion plants in the ground. Check out the following resources for information so you can grow a successful onion crop. As you watch the videos and read about growing onions, take note of the following information:
Nutsedge, also known as nutgrass, seeks out the moist, poorly drained sections of your yard. Its leaves are grass-like and yellow-green, while the spiky head is purple or yellow. It's a tough weed to control because it grows from tiny tubers, or nutlets, that form on roots and can grow 8-14 inches deep in the soil. Getting rid of this weed can be accomplished but it requires diligence and patience on the part of the gardener. Learn more from this article from SFGATE.
https://homeguides.sfgate.com/kill-nutsedges-vegetable-garden-40243.html