Keto-Friendly Vegetables for Your Fall Garden

California is one of the best regions in the United States for year-round gardening. Much of the state enjoys a mild Mediterranean-style climate characterized by warm, dry summers and cooler, wetter winters. However, California’s enormous geographic diversity creates a surprisingly wide range of growing conditions, spanning everything from cool mountain regions to subtropical coastal environments. Because of this, growing conditions can vary dramatically depending on location.

California is the most agriculturally diverse state in the country due to its range of climates, fertile soils, long growing seasons, and varied geographic regions.

California planting zones range from USDA Zones 5a through 11a, making the state one of the most agriculturally diverse in the country. Northern California tends to experience cooler temperatures and higher rainfall, while Southern California enjoys milder winters and longer growing seasons. Understanding your local growing zone is essential for planning a productive garden, selecting the right crops, and knowing the best planting times throughout the year. Frost dates, seasonal temperatures, and regional climate patterns all play a major role in determining what varieties will thrive in your area.

One of the greatest advantages of gardening in California is the incredible range of crops that can be grown successfully. In fact, California produces more than 200 commercial crops and leads the nation in the production of several specialty foods including avocados, and artichokes. Home gardeners can enjoy excellent success growing tomatoes, squash, herbs, greens, brassicas, root vegetables, berries, citrus, and countless other fruits and vegetables throughout much of the year.

As summer begins to fade, many Southern California gardeners are surprised to discover that the gardening season is far from over. In reality, September through November are often ideal months for planting cool-season crops such as leafy greens, brassicas, carrots, radishes, beets, onions, and garlic. The milder fall and winter temperatures create excellent growing conditions for many vegetables that struggle during the intense summer heat.

Whether you are planting a small backyard vegetable garden, a moderately sized homestead plot, or decorative flower beds, California offers one of the longest and most rewarding growing seasons in the nation. With proper planning and an understanding of your local climate zone, it is possible to harvest fresh food and enjoy productive gardening nearly all year long.

What Veggies Can You Plant in Autumn?

Plant cold-resistant vegetables and herbs in the fall to harvest for the holiday table.

Fall-planted veggies are perfect for holiday harvests, cold storage, or overwintering. If you have season extension devices like cold frames, hoop houses, mulches, or frost protection fabric, you may have even more options for autumn vegetable gardening.

Depending on your growing zone, you can plant:

Zones 4 and 5 Cold hardy brassicas and storage roots will be ready for frost-sweetened harvests before heavy snowfalls hit. You also have a moderate window of time for quick-growing baby spinach, lettuce, and other cool-weather greens.

In Southern California, we are in Planting Zone "9b"

With an average yearly temperature of 65.9°F, our region has a January-December (whole year) growing season and is located in a warm temperate dry forest.

Averages

• Low Temp: 30°F

• Rainfall: 16''

• Sunny Days: 280

• Altitude: 1000'

There are also several herbs like parsley, cilantro, and peppery cress that love the autumn chill. And you can’t forget garlic! Aside from hot subtropical climates, You can enjoy an abundant harvest of spicy bulbs the following summer.

Keto-Friendly Vegetables for Your Fall Garden

Your backyard garden doesn’t have to die down once the temperatures cool down. There’s plenty of keto friendly veggies you can plant during the cooler fall months. Put on some boots and get these veggies in the ground before it’s too late!

Garlic

In SoCal, garlic is planted in late fall/early winter, and harvested in the summer.

Garlic loves the cold. With its spicy aroma and rugged resilience, garlic is one of the easiest crops to grow. In SoCal, garlic is traditionally planted in late October, until November/December to harvest in the summer.

Southern growers usually opt for soft-neck varieties that don’t need the cold treatment of vernalization. You can also pre-chill the seed garlic in the refrigerator before planting.

Remember, you should not peel seed garlic! You want to keep as many layers of “papers” as possible to help the clove grow into a full-size garlic bulb.

Check out this guide on How to Plant, Grow, and Care for Garlic !

Turnips

Turnips are planted in fall and mature in 60 days.

Turnips are round, hardy roots which are planted in autumn and mature in 50 to 60 days.

Important Notice: Do not consume the green leaves as they are loaded with oxalates.

For storage, you can dig up the plants, remove the greens, and store the roots in a cooler at 32-40° for 4-6 months.

Add them to stews, roasts, and soups.

Onions and Scallions

Onions are planted in September and harvested once they’re 6-12” tall.

Once they’re 6-12” tall, use a knife to individually harvest green onions (scallions) for your autumn meals. This process will increase the spacing to 3-4” apart to allow the remaining plants to grow into full-size onions.

Onions are quite hardy and tolerate the cold very well. They can withstand temperatures down to about 20°F.

Whether you prefer green onions or full-sized bulbs, they are best planted in September. Start with seeds, transplants, or “onion sets” for a quicker reward. Seed them about 1” apart in rows that are 6” apart.

Radishes

Radishes are planted at 40-60°F temperature range and harvested 4-6 weeks later.

Radishes can tolerate down to 20-30°F, but prefer a mild 40-60°F temperature range. They aren’t particularly frost-hardy but they do grow fast (4-6 weeks) which makes them perfect for sneaking into the empty spaces of your fall garden. These red roots also come in purple, white, pink, yellow, and even black (hello spicy Spanish radishes)!

They also make great additions to fall fermentations like kimchi and sauerkraut. You can pull as needed (just don’t let them get too oversized!)

You may choose daikon and “watermelon” radish types for the best fall root harvests. Check out this guide on How to Plant, Grow, and Care for Radishes !

Kale

Kale is planted in October and harvested regularly.

Kale is a typical cold-resistant and continuous yields autumn vegetable, the leaves of which become sweeter from the cold. The accumulation of sugars occurs because starch molecules inside the plant are converted to natural sugars in chilly weather.

In SoCal, kale is typically planted late September/October.

Harvest your kale regularly! Pull the oldest leaves and always leave the center growing tip intact.

Cauliflower

Cauliflower is planted in October and harvested 10 weeks later.

Cauliflower is an indispensable vegetable in autumn dishes. Fall soups and roasts just aren’t the same without cauliflower.

You can direct seed cauliflower as late as October in our region. It prefers to grow at 50-60°F and takes up to 10 weeks for it to mature.

Cauliflower is notoriously susceptible to aphids, cabbage worms, and flea beetles. To exclude these pests, it helps to cover the seedlings with row fabric. Companion plant with sweet alyssum, dill, marigold, and/or yarrow to help attract beneficial insects.

Check out this guide on How to Plant, Grow, and Care for Cauliflower !

Broccoli

Broccoli is planted in October and harvested 3 months later.

You can direct seed broccoli as late as October in our region. It prefers to grow at 50-60°F. The seeds require 85 to 100 days to mature into full heads. You can even extend the harvest after you cut the initial head by harvesting side shoots throughout late autumn.

You may consider growing sprouting broccoli or “broccolini”. Varieties such as ‘Happy Rich’, ‘Melody’, and ‘Sweet Stem’ produce an abundance of long tender-stemmed florets that have an extra sweet flavor and miniature size for easy preparation. They keep putting out shoots up until the first fall freeze and they taste absolutely delicious on the grill.

Cabbage

Cabbage is planted in October and harvested 3-4 months later.

Like broccoli and cauliflower, cabbage is a cool-weather brassica that thrives in autumn weather. Unlike the bland green cabbage at the grocery store, you may choose from over 400 unique varieties and colors from around the world.

You can plant cabbage seedlings as late as October in our region. Cabbages can be cut in held in the refrigerator for up to 4 months. Particularly, Napa and Chinese cabbages are best for fermenting and preserving.

Check out this guide on How to Plant, Grow, and Care for Cabbage !

Lettuce

Lettuce is planted in September-October and harvested 3 weeks later.

Lettuce prefers to grow in cool weather. Anyone who has tried to grow salad greens in the summer heat has experienced how quickly lettuce can turn bitter and go to seed. That’s because lettuce is naturally a cool-weather crop that loves the spring and fall seasons. This allows the lettuce to develop in the milder weather it prefers to maintain a frilly, tender texture.

September and October are the ideal times to start getting fall lettuce off to a great start. Lettuce seeds can germinate in soils as cold as 40°F. Keep consistently moist and enjoy chill-sweetened salads within 2-3 weeks.

You can “cut and come again” as long as you leave the center growing tip intact. Gather an array of different textures and colors of lettuces (for example, red butter, green incised, and wavy romaine), mix the seeds together, and directly sow in the garden at a rate of 4-6 seeds per inch in rows about 2” apart. Tamper lightly and cover with ⅛” of soil.

Parsley

Parsley is planted in September-October and harvested 2.5 months later.

Fall is prime parsley-planting time because it yields in much greater abundance than spring parsley.

Parsley takes up to 3 weeks to germinate and 75 days to mature. It prefers partial shade to full sun.

Parsley comes in flat-leaf and curly varieties, the latter being the most cold-hardy but the prior is more flavorful for culinary use.

Cilantro

Cilantro grows in fertile, moist, compost-rich soil continously.

This herb prefers to grow in cold weather as it tends to fade in hot weather.

While most of us crave cilantro in summer tomato salsas, this herb naturally prefers chilly weather. Cilantro tends to grow vigorously in the fall. You can dry or freeze an abundance of this herb.

Cilantro is very beginner-friendly because it doesn’t mind excess moisture or overcrowding. Nonetheless, the best cilantro crops are grown in fertile, compost-rich soil with a continuous supply of moisture throughout the fall season.

Check out this guide on How to Plant, Grow, and Care for Cilantro !

Cress

Cress is planted in September and harvested once it is 2” tall.

This lesser-known fall green has a mild peppery, mild flavor and has an abundance of nutrition.

This fall green is extraordinarily easy to grow. You can seed in a 2-4” wide band for baby greens or thin to 4” apart for larger florets. Begin harvesting when they reach 2” tall.

You may choose between watercress or upland cress. Both require a lot of moisture, but watercress is particularly finicky about water. As our region doesn't get much fall rain or humidity, opt for an upland cress.

Rutabagas

Rutabagas are planted in late winter.

Originating in Scandinavia, rutabagas are a plump root relative of cabbage and turnips. They have a distinctive buttery and bitter-savory flavor with a cooked texture reminiscent of potatoes.

Rutabagas are also called “Swedes” in Great Britain and are far more popular across the pond than they are here in the USA. However, their impressive nutrient profile and easygoing growth habit make them the perfect autumn garden addition for growers in our region in SoCal.

You can plant them in late winter.

Leeks

Leeks are planted in fall and harvested 4 months later.

The buttery delicious, infamously slow-growing onion cousin "leek" is an excellent vegetable to grow in your fall garden. Baby leeks grow into thick stalks that remain very frost-hardy even through freeze-thaw cycles.

A key secret to growing incredible leeks is to keep them “hilled up”. Every few weeks, mound more soil onto the base of the plants. This blanches the bottoms and makes them sweeter in the kitchen.

Leeks take up to 110 days to mature. Inconsistent moisture can further delay the process. For impatient gardeners, choose quicker-maturing varieties like ‘King Richard’ or ‘Lincoln’.

Brussels Sprouts

Brussels Sprouts are planted in October and harvested 3 months later.

Brussels sprouts are able to withstand extreme climatic conditions and produce a good harvest.

While admittedly challenging even for experienced gardeners, Brussel Sprouts are worth including in a fall garden because they can yield in such abundance and tolerate extreme conditions.

Brussels sprouts can be planted in an area with plenty of space and direct sunlight.

Prepare seedlings indoors now or direct seed into the garden in early October. Each plant prefers at least 18-24” of space and plenty of fertilizer to fuel their growth.

At 90 days to mature, brussels sprouts do require a bit of patience and care, but each plant can produce an impressive amount of sprouts for holiday meals.

You can find very valuable information on this site:

https://www.allaboutgardening.com/

Visit www.comfortketo.com to check when dishes featuring these fall vegetables return to the menu.

Bon Appétit!

Chef Janine.