If you are a new gardener, you’ll want to know a little bit about harvesting the fruit of your labor. Harvest leaf plants, root veggies and summer squash while they are young and tender. Fertilize everything once a month except beans. (I use worm tea as my fertilizer). Make sure to water regularly as it gets hotter.
Vegetables: Although it will begin to get hotter this month, there are still a number of veggies we can plant here from seed. These include corn, cucumber, green beans, lima beans, leaf lettuce (its better if its shaded by something like tomatoes), okra, peppers, pumpkins, New Zealand spinach (I buy mine from http://www.bakerseeds.com), summer and winter squash and melons. Additionally, some veggies can be planted from seed year-round here. These are beets, carrots, Swiss chard, radishes and turnips. Transplant eggplant and peppers. For a later tomato crop, you can still plant from seed now or transplant tomatoes next month.
Herbs: You can also transplant basil, cilantro,oregano, parsley, rosemary, sage, summer savory and thyme. You can seed-plant basil and parsley.
Flowers: You can plant summer annuals from seed but it will be a short season for them. Obviously, the sooner, the better. These include anchusa, coleus, cosmos, lobelia, marigold, portulaca, sunflower (especially dwarf), sweet alyssum and zinnia. As transplants, plant bearded irises, bellflower, black-eyed susan, coneflower, fuchsias, morning glories (which are invasive but also drought resistant), orchid cacti, periwinkle.
Tropicals: Plant tropical fruit trees such as avocado, banana, cherimoya, citrus and pineapple guava. Keep them well watered until established.
One of the most important things in Southern California from now until the end of summer is to water regularly. And, if you are a new gardener, please tell me how it is going!