Lettuce may not look like it has much to offer, but this member of the daisy family can provide good food, ground cover, and fun!
Lettuce is a biennial garden staple that finds its way into most burgers and lays the foundation for nearly every salad ever made. With half of the world’s lettuce crop being grown by China, and numerous cases of E. coli and Salmonella poisoning in bagged salads, lettuce should be one of the first garden plants you try. Fresh lettuce is cheaper, tastier, safer, and far better for the environment than anything that has been shipped from halfway around the planet.
History of lettuce
The ancient Egyptians took advantage of a certain type of weed, whose seeds contained a lot of oil. Over time, those weeds became domesticated and the edible leaves started being used for food and medicine. The Romans gave lettuce its Latin name, Lactuca sativa, for the white latex (lactuca) that drips from cut stems. (Sativa means cultivated.) Being people, we saved seeds from our favorite types to ultimately create nearly 150 varieties of lettuce.
Lettuce generally grows in a crisphead, loose leaf, or romaine form, but there are seven cultivar groups:
Loose leaf and romaine lettuces can be harvested in a cut and grow method, in which outer leaves are removed for consumption and the plant is allowed to continue providing edible leaves for the entire growing period.
How to grow lettuce
Lettuce, like spinach, tends to bolt when it gets really hot outside, so fall, winter, and spring are the best times of year for growing lettuce in the Bay area. Lettuce can be grown in containers, straw bales, in the ground, or on a window sill. Lettuce prefers sun, but it can grow just fine in shade gardens, too! In spite of its taproot, lettuce does not need a particularly large or deep container to provide you with fresh leaves for your sandwich or salad.
Lettuce seeds are really tiny, so don’t try planting outside on a windy day. (Yep, I learned that one the Hard Way.) Seeds only need to be covered with 1/4” of soil, but they must be kept moist until they germinate. Spacing between plants depends entirely on the variety. Keep planting new seeds every few weeks, in succession, for a continuous harvest.
Once temperatures start rising, your lettuce plants will probably bolt, or go to seed. You can tell this is happening because your docile, rounded lettuce plants will suddenly send up a spike of growth from the center that looks very un-lettuce-like. If you allow this to continue, and I urge you to do so, your lettuce plant will become too bitter to eat, but it will produce flowers and seeds for future generations. I allow my lettuce plants to go to seed and let them fall where they will. (You can also wrap bags around flowering heads to collect seeds.) I now have an attractive foodscape, with all sorts of lettuces growing in all sorts of places. Unless it’s the peak of summer, I can create a fresh salad with a variety of lettuces simply by walking around my backyard!
Lettuce pests & diseases
Aphids are a lettuce plant’s worst enemy, with snails and slugs being a close second. Earwigs, cutworms, weevils, rabbits and burrowing rodents will all be attracted to your lettuce, and white mold can sometimes be a problem.
Does lettuce really turn brown faster when cut with a knife? No, it doesn’t.
Finally, any packet of lettuce seeds that you buy will have far more seeds than you will be able to use in a growing season. Solution: invite your friends over for a seed-luck. What's a seed-luck? That's when everyone brings a packet of a different type of lettuce seed, a dessert, and a bottle of wine. You will need to provide little packets or envelopes for guests to (decorate and) use to take their bounty home. A good time is sure to be had by all, and everyone ends up with a bigger variety of lettuce!
Beans, beans, the magical fruit.
The more you eat, the more you…well, you know.
What you may not know about this nutritional powerhouse is that it is crazy easy to grow, germinates at lightening speed, adds nitrogen to the soil, and is just plain fun to watch grow.
Beans are the edible seeds of the legume family. Often, but not always, these seeds are kidney-shaped. There are over 40,000 different type of beans found in the world. Some of the more common varieties are:
How's that for a family tree?
How to grow beans
Growing most beans is really simple. Seeds can be planted 1/2 to 4 inches below soil level, watered a little at first, and then only occasionally afterward. Under ideal conditions, some beans can germinate within just 4 days, making them an excellent crop for children. Beans are not very competitive plants, so you can help your bean plants thrive by regularly weeding the area until they are firmly established.
If you have heavy clay soil, be sure you do not overwater. Clay soil can hold so much water that plants will rot or drown. Now, if you want to get really fancy (and better results), you can inoculate the seeds with a species-specific Rhizobium bacteria. This does not mean giving tiny shots to each and every seed (But it’s a funny image, right?) Beans can be dusted with, rolled in, or briefly soaked in the inoculant at planting time to help them get the most nitrogen out of the soil, for a better start. Personally, I’ve never used inoculants, but many gardeners and most farmers swear by them, especially in areas where beans have not been grown for a long time.
Generally, bean plants come in one of two growth habits: bush (determinate) or vine/pole (indeterminate). As with other crops, determinate types tend to flower and develop pods within a set time frame, whereas indeterminate types tend to continue on for longer periods of time, producing pods as they grow. Beans prefer plenty of sunlight, but they can be grown in partial shade, as well.
Adding beans to a garden or landscape can help fix atmospheric nitrogen into the soil, making it available to other plants (assuming you cut your beans down and let them decompose before they go to seed. Cowpea roots are pretty tough and deep, so they can also help improve soil structure and reduce compaction. Most beans make an excellent cover crop.
If you grow beans regularly, it is a good idea to rotate the bean crop with sunflowers, tomatoes, or wheat, to interrupt the life cycle of some fungal pests. Beans are susceptible to damping-off by Pythium, Rhizoctonia, Fusarium, and other pathogens. Thrips and cutworms are common pests. The corn maggot larvae (Delia platura) may gnaw on your planted beans, as well.
As tempting as it may be to plant beans that were bought at your local grocery store, this is a bad idea. Those beans can carry diseases that you may never be able to get out of your soil, once they arrive. These diseases are not harmful when eaten by people, but they can be devastating to baby bean plants. Instead, invest in certified bean seed, and then save seed from your crop for next year’s planting!
As a food, beans are high in protein, fiber, iron, potassium, thiamine, vitamin B6, and folic acid, with no cholesterol. Wikipedia has an excellent graphic that shows the protein, finer, and iron content of various beans. [Spoiler alert - lentils and kidney beans top the chart!]
Beans are part of the Three Sisters method of growing used by Native Americans. The Three Sisters Method intercrops corn, squash, and beans to make the most of available growing space, soil nutrients, and water resources. The corn grows tall, the beans climb the corn, and the squash shades the ground and reduces weed competition with wide leaves.
Because beans grow so fast, they can be a fun window sill garden addition.
(And if you want to avoid the undesirable side effects of eating beans, be sure to change the water a few times during soaking and/or cooking. Beano helps, too.)
Black-eyed peas are said to bring good luck when eaten on New Years’ Day, but don’t wait that long! Put them to work in the garden for better growing all year.
Green manures are crops that are cut and either dug back into the soil or allowed to decompose on top of the soil, before they go to seed. Cowpeas will keep adding nitrogen to the soil right up until they start producing baby cowpeas of their own. Then, that nitrogen is absorbed by the plant and put to use. The nice thing about edible cover crops is that, even if you miss the mark and the plant goes to seed, you still get food!
Cover crops are grown for several reasons. They prevent erosion, add organic matter and nitrogen to the soil, reduce weeds and deter some soil borne pests.
Cowpeas are drought tolerant, germinate rapidly, and don’t seem to be bothered by heavy clay soil. In fact, these garden workhorses can be used to break up compacted soil with little to no effort on your part! While these beans prefer sun, they can also be incorporated into shade gardens. Fusarium wilt, aphids, weevils, and pod borers are the most common pests.
Beans have long been used in companion planting or intercropping. Native Americans used the Three Sisters method of growing beans, squash and corn together. The squash shaded the ground, the beans climbed the corn and the corn soared skyward with the shaded ground and nitrogen-rich soil.
How to grow cowpeas
If you have areas of compacted or bare soil, it is simple enough to poke holes in the soil and drop in a cowpea. Cowpeas are not particular. The hole can be 1-4 inches deep. Plants should be spaced 2 to 3 inches apart and protected from birds until they sprout, which can happen in as little as 4 days!
If you are feeling particularly creative or ambitious, you can plant cowpeas into patterns around trees, walkways, or other landscape features. As the plants come up, they will add a new texture to the garden, along with improving the soil structure and nutrient content!
Condiment or cover crop, mustard’s sunny yellow flowers, tasty seeds, and deep tap roots make it a useful plant worth learning about.
A member of the Brassica family, mustard is a popular hot dog condiment and a cheery yellow weed that grows in even the driest areas. Before ripping out any stray mustard plants in your garden, consider these benefits:
As mustard nears the end of its life cycle, you can feed the soil or feed yourself. By mowing the plants before they go to seed, nutrients are added to the soil. If the plants are allowed to go to seed, the seeds can be collected and used in cooking or to make your own prepared mustard. The condiment is made by combining crushed seeds with vinegar and water. The leaves (greens) are also edible and oil can be extracted from the seeds.
Mustard is related to radishes and turnips. People have been growing it for nearly 4,000 years. There are three basic types of mustard: white (Sinapis hurta), black (Brassica nigra), and oriental (Brassica juncea). White mustard is most commonly used as a cover crop.
Ground cover refers to low-growing, spreading plants that help prevent erosion, weeds, and water loss.
Bare dirt in the garden is not a good thing. Naked soil is vulnerable to wind and water erosion, compaction, and nutrient leaching. The Dust Bowl of the 1930’s is a perfect example of what happens when soil is not managed properly. Topsoil is a precious commodity and we all need to work to protect it. Ground cover is an excellent method that requires very little effort and improves biodiversity in the garden.
Benefits of planting ground cover
As the roots of ground cover plants work their way deeper into the soil, they help prevent erosion and the loss of nutrient rich topsoil and water. The leaves and stems shade the ground, stabilizing temperatures. Ground cover plants also reduce the chance that weeds will grow. In fact, ground cover plants are used to replace weeds.
Ground cover plant selection
Ground covers are traditionally shorter plants, but they come in a variety of heights, colors, and textures.There are five basic types of ground cover:
A good resource for plants suited to the Bay area can be seen at the UCANR pages on ground cover. Wikipedia also provides links to many popular ground cover plants. Keep in mind, when selecting ground cover, that many of these plants will spread and fill an area. Invasive plants, such as Algerian or English ivy, ice plant, periwinkle (Vinca major) and licorice plant should not be used. In theory, traditional sod lawns are a form of ground cover, but they are unsuitable for drought-prone areas, requiring unsustainable amounts of water and nutrients.
Yarrow (pictured) makes an excellent ground cover. It can grow as tall as 2’, but will maintain a low growth if it is mowed occasionally while still young. It grows well in our hard clay soil and its soft feathery texture feels wonderful on your feet! Oregano and other low-growing herbs smell wonderful as you walk on them, and curly endive is surprisingly durable. If you don’t mind some height, annual rye grass has been shown to put roots down as far as 40”, helping to break up compacted soil. Mustard can help, too.
Ground cover vs. cover crop
Cover crops are usually grown with the intention of pulling them out of the ground and leaving them on top to decompose, or digging them into the soil, to return all of the nutrients contained in the plants back to the soil. Ground covers are plants grown with the intention of leaving them to continue growing indefinitely.
Plant-less ground covers?
Rather than exposing valuable topsoil to the elements, mulch is another option to ground cover plantings. Wood chips can be found for free from local tree trimming companies and it makes an excellent protective barrier. As the mulch breaks down, nutrients are added to the soil. Also, the mulch helps retain moisture and stabilize temperatures, providing a safe haven for earthworms and microorganisms that improve soil health.
If we say something is sustainable, we mean that it can keep going. Since agriculture and gardening are critical to our food supply, being sustainable is pretty darned important.
Until the 1980’s, food production was focused on the industrial production of single species (mono crops), using chemical fertilizers and pesticides, until the soil was exhausted. You can only do that for so long, before you run our of places to grow food. In 2002, at the International Society of Horticultural Science’s First International Symposium on Sustainability, it was agreed that sustainable agriculture and gardening were critical for the “well being of human societies”.
Sustainable gardening incorporates practices that reduce water, energy, time and chemical consumption, while producing food year-round and protecting the environment. These practices take the following issues into account:
Design for sustainability
Whether you already have a garden or are just starting out, you can design a garden or landscape for sustainability. Native plants are always your best bet because they put millions of years of evolution to work for you, conserving water, reducing the need for chemicals, and freeing up your time. Lawns are notorious water wasters and, quite honestly, most of us are not British aristocracy. Other plants, such as oregano, yarrow, or clover, make excellent, low-growing ground covers that use less water and rarely, if ever, need mowing.
These tips can help you create your own sustainable garden:
Late autumn and early winter often leave our gardens looking bare and unsightly. One way to improve both the appearance and the health of your garden is to use winter cover crops.
Cover crops, also known as green manure, are grasses and legumes that grow quickly. As soon as summer crops are harvested and the last, struggling tomato plant has succumbed to frost, you can plant your cover crops. Any rains that come will help speed their growth. Before they can flower, they are cut back and/or tilled back into the soil.
Legumes are particularly valuable as they add nitrogen to the soil. Popular legume cover crops include Black-eyed peas (pictured above), Fava beans, soy beans, red or crimson clover, and hairy vetch. You can even grow peas and keep trimming the tips (which are excellent in salads) to prevent them from flowering and going to seed. Once a legume has gone to seed, it begins pulling nitrogen from the soil like any other plant. Of course, there's nothing wrong with fresh peas and beans!
Cover crops also help reduce erosion, suppress weeds, and improve soil health. Inexpensive and easy to grow, cover crops are a simple investment in your garden’s long term health. [They look nice, too!]
I hope this information inspires you to grow more of your own food. You can ask your garden questions on my Home page.