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A Simple Way to Grow Fresh Greens Indoors This Winter

Just because the temperatures have started to drop doesn’t mean you have to live without fresh greens until Spring.

Author and gardener Peter Burke’s innovative method of growing soil sprouts indoors can help you grow nutrient-dense greens all year long at a fraction of the cost of buying at market.

Burke’s book, Year-Round Indoor Salad Gardening, is an inviting guide for both first-time and experienced gardeners in rural and urban environments. No matter what size home you live in, there’s room for a garden of soil-grown sprouts. In fact, Burke has grown up to six pounds of greens per day using just the windowsills in his kitchen. And, since they grow so quickly—less than 10 days from seed to salad—soil sprouts can be an engaging indoor project for kids.

In his book, Burke provides detailed step-by-step instructions to master this simple method of growing greens. The only tricky part is understanding how different growing soil sprouts is from standard outdoor gardening. One of the first steps is placing your tray of seeds and dirt in a dark cupboard, not a typical place for your average plant. In the excerpt below you’ll learn all the ways growing soil sprouts runs counterintuitive to gardening and how these tricks not only make sense, but really work!


6 Reasons Why Growing Soil Sprouts is Counterintuitive to Gardening

By Peter Burke

Growing soil sprouts runs counter to much of what I always held true about gardening in general. When I try to explain soil sprouts to my farming friends and gardening buddies, they often have trouble understanding the concept at first. I know what bothers them: They think that if they plant 70 sunflower seeds or 150 broccoli seeds, their crop will be enormous compared to the tray of greens I describe.

One farmer complained, “It is so seed intensive.” He thought too many seeds were required, and he dismissed the idea. He reasoned that one mature sunflower could produce easily hundreds of seeds, or each full-grown plant a large head of broccoli. Why harvest the sprouts before they’ve had a chance to produce their full yield?

But when you look at it in a different light, it makes sense. No one would call it “seed intensive” to grind up wheat berries or corn kernels— which are viable seeds—to make bread or object to boiling rice to make dinner. Soil sprouts are just another way—a different way—to eat seeds. Rather than grinding or boiling I grow them for a short time. Plus many of the seed varieties that I grow for greens wouldn’t be used as food themselves, like radish seeds and broccoli seeds. With my methods, seeds that could only be planted in the outdoor garden in the past can now be used to grow fresh greens indoors. They’ve found a useful place in the pantry as winter food. An indoor salad garden can even work as a full-time garden for those who live in apartments or condominiums with no other place to grow their own food.

Indoor Gardening Takes a Different Approach

The techniques that work for an indoor salad garden of soil sprouts are not the same as those I use for my earth garden. Much of what I had learned about gardening went out the window when I started this project. An indoor garden required an entirely different approach. For instance, instead of watering the seeds after planting, as I would normally do in my earth garden, I water the seeds before planting by soaking them. Where I usually plant seeds in the soil outdoors, for soil sprouts I scatter the seeds on top of the soil indoors. In my outdoor garden seeds are planted in carefully spaced patterns. For my indoor garden’s soil sprouts I spread the soaked seeds on top of the soil so close together that the seeds touch.

Normally gardeners take pains to provide plenty of light for young plant starts, providing grow lights from the moment the new plants emerge from the soil. It’s a totally opposite approach for soil sprouts; I start them in the dark for 4 days.

For the experienced gardener, it’s a bit of a challenge to go against the grain of years of gardening outdoors. I know it was for me. If this is your first garden and it’s all new, you don’t have the “this-is-how-I-usually- do-it” attitude to overcome. But I should give you fair warning that if your expert gardener friends tell you you’re doing it all wrong, they would be right—that is, if you were growing outdoors!

Just be patient and invite them over for a fresh salad sometime in January, when they’re frozen out of their own gardens.

1. Watering the Seeds First

Presoaking gives the seeds a jumpstart before planting. Usually seeds must soak up enough water from the soil to initiate growth. Depending on the environment it might take days before the seeds even begin to sprout. Although soaking is common to hasten the process of growth for large seeds, with soil sprouts all of the seeds are soaked first, regardless of size. This step is a key to realizing the “fast growth” found in indoor salad gardening.

2. Plant on Top of the Soil

Planting the seed on top of the soil also saves a day or two because the stem and leaf don’t have to push up through the soil. It also prevents the seed hull and leaves from being covered in soil and keeps the sprout cleaner. Cleaner stems and leaves mean there’s less of a chance the plants will develop damp off (a disease that quickly kills young shoots) or molds, and the greens are easy to clean at harvest time. If you’ve ever cleaned fresh greens from the garden, you’ll appreciate this aspect of soil sprouts.

3. Seeds Are Touching

Outside I would need a 50-foot garden row to plant the same tablespoon of sunflower seeds that I use inside in a small tray that’s only 1⁄8 of 1 square foot in size. By planting the seeds so close that they touch, I get the maximum possible harvest of greens from the smallest possible area. The seed has only enough room to send a root down into the soil and a stem up toward the light, but this is entirely adequate for the short “growing season” of shoots.

4. Grow in the Dark

Growing in the dark also flies in the face of everything I know about vegetable gardening. For my traditional garden I use lights and a cold frame or a greenhouse to give young plants plenty of light in the early stages. But soil sprouts are grown for the stem and first leaves of the plant only, and the first few days of darkness encourage a long stem to grow by “forcing” the seed to search for light. Outdoors, in more hostile conditions, a seed stem may have to make its way through a pile of leaves or straw before it comes out of the dark. The simulated darkness of a tray with paper covers takes advantage of this natural urge in plants to search for light. It encourages a very productive harvest. Total darkness isn’t necessary; even low-light conditions will do the job of forcing the sprouting seeds to develop long stems in the first stages of growth.

5. Plant Every Day

In my outdoor earth garden I typically plant varieties like tomatoes or squash once per season. For vegetables like lettuce and carrots I do a second planting at mid-season to harvest a fall crop. For varieties like radishes I replant every 2 weeks and enjoy a steady supply of fresh roots all growing season.

With soil sprouts I plant every day. For a steady supply of greens from my indoor salad garden, planting every day is key. I routinely start small batches of seeds, about 5 tablespoons (74 ml) spread over five trays each day. So every day a batch of seeds planted a week ago are coming to harvest. And I know just how many trays I’ll need, week to week, harvesting just what I need each time. I want my indoor salad garden to remain small and manageable, not large or time-consuming.

6. Harvest More from the Seed

As I explained above my objective when growing sprouts in soil is to encourage rapid growth of the stem and a large seed leaf (called a cotyledon). This allows me to harvest nearly all of the stored nutrition from the seed. This general principle has been understood in Asia and elsewhere for many centuries. I was surprised to read an Italian recipe from the year AD 1624 that included radish sprouts, and the English have used cress sprouts for many years, too. Rich in vitamin C, cress sprouts helped sailors to combat scurvy on long voyages. For my indoor salad garden, I’ve included a variety of seeds and developed in-depth techniques to grow soil sprouts full time.

Some mystery still remains, though, even after all these years working with seeds. I’m always excited by the miracle I witness each time I soak them for another batch of sprouts. As soon as I pour the water onto the seeds, it’s off to the races, with all the potential in those little “horses” galloping to the finish line—I can almost hear the cheers!

I’ve learned a lot about seeds and sets from growing soil sprouts; in fact some of the techniques I’ve put to good use in my outdoor garden, too. Take peas, for instance. They’re hardy in the cool Vermont spring, but that’s truer for the plant than the seed. An early, wet spring can make for patchy germination at best, and other times the peas just rot in the soil. One early spring day a few years ago, I realized that I had all these hale and hearty pea sprouts growing indoors in trays, and I wondered, “ Why not transplant them outdoors?”

They were an instant success.

I planted two rows of peas, and they had no trouble growing perfectly well, with no setback effect from transplanting. This was especially surprising. The typical book on gardening will tell you that peas do not transplant well!

For many years, I have had an annual bet with a friend of mine: Whoever grows the first 3-inch pea plant wins. He categorically ruled this transplantation technique unfair. For our bet the seeds must be planted directly in the ground outdoors. Still I plant an extra-early batch of peas just for bragging rights—and for the delicious sweet peas, too. Sometimes going against the grain, stepping outside the box and doing something counterintuitive, offers rich rewards. Growing soil sprouts is one of those times.


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