Try these organic tips and tricks to get the most out of your planting space.
Imagine harvesting nearly 50kgs of tasty, beautiful, organically grown vegetables from a 5m -by-7m plot, 40kgs of tomatoes from just 14m3 (a 2m-by-7m), or 10kgs of carrots from just 3m2. Yields like these are easier to achieve than you may think. The secret to super productive gardening is taking the time now to plan strategies that will work for your garden. Here are seven high-yield strategies gleaned from gardeners who have learned to make the most of their garden space.
1. Build Up Your Soil
Expert gardeners agree that building up the soil is the single most important factor in pumping up yields. A deep, organically rich soil encourages the growth of healthy, extensive roots that are able to reach more nutrients and water. The result: extra-lush, extra-productive growth above ground.
The fastest way to get that deep layer of fertile soil is to make raised beds. Raised beds yield up to four times more than the same amount of space planted in rows. That’s due not only to their loose, fertile soil but also to efficient spacing—by using less space for paths, you have more room to grow plants.
How do raised beds save so much time? Plants grow close enough together to shade out competing weeds so you spend less time weeding. The close spacing also makes watering and harvesting more efficient.
2. Round Out Your Beds
The shape of your beds can make a difference, too. Raised beds are more space-efficient if the tops are gently rounded to form an arc. A rounded bed that is 2m wide across its base, for instance, will give you a 2m wide arc above it—creating a planting surface that’s 0.5m wider than that of a flat bed. That foot might not seem like much, but multiply it by the length of your bed and you’ll see that it can make a big difference in total planting area.
In a 6m -long bed, for example, rounding the top increases your total planting area from 10m2 to 13m2. That’s a 20 percent gain in planting space in a bed that takes up the same amount of ground space. Lettuce, spinach, and other greens are perfect crops for planting on the edges of a rounded bed.
3. Space Smartly
To get the maximum yields from each bed, pay attention to how you arrange your plants. Avoid planting in square patterns or rows. Instead, stagger the plants by planting in triangles. By doing so, you can fit 10 to 14 percent more plants in each bed.
Just be careful not to space your plants too tightly. Some plants won’t reach their full size—or yield—when crowded. For instance, when one researcher increased the spacing between romaine lettuces from 20cms to 25cms, the harvest weight per plant doubled. (Remember that weight yield per square foot is more important than the number of plants per square foot.)
Overly tight spacing can also stress plants, making them more susceptible to diseases and insect attack.
4. Grow Up
No matter how small your garden, you can grow more by going vertical. Grow space-hungry vining crops—such as tomatoes, pole beans, peas, squash, melons, cucumbers, and so on—straight up, supported by trellises, fences, cages, or stakes.
Growing vegetables vertically also saves time. Harvest and maintenance go faster because you can see exactly where the fruits are. And upward-bound plants are less likely to be hit by fungal diseases thanks to the improved air circulation around the foliage.
Try growing vining crops on trellises along one side of raised beds, using sturdy end posts with nylon mesh netting or string in between to provide a climbing surface. Tie the growing vines to the trellis. But don’t worry about securing heavy fruits—even squash and melons will develop thicker stems for support.
5. Mix It Up
Interplanting compatible crops saves space, too. Compatible combinations include tomatoes, basil, and onions; leaf lettuce and peas or brassicas; carrots, onions, and radishes; and beets and celery.
6. Succeed With Successions
Succession planting allows you to grow more than one crop in a given space over the course of a growing season. That way, many gardeners are able to harvest three or even four crops from a single area. For instance, an early crop of leaf lettuce can be followed with a fast-maturing corn, and the corn followed by more greens or overwintered garlic—all within a single growing season. To get the most from your succession plantings:
- Use transplants. A transplant is already a month or so old when you plant it, and so will mature that much faster than a direct-seeded plant (one grown from seeds sown in the garden).
- Choose fast-maturing varieties.
- Replenish the soil with a 10mm-to-15mm layer of compost (about 4 x 25kg bags per 10m2) each time you replant. Work it into the top few inches of soil. Peats Garden Compost is ideal.
7. Stretch Your Season
Adding a few weeks to each end of the growing season can buy you enough time to grow yet another succession crop—say a planting of leaf lettuce, kale, or turnips—or to harvest more end-of-the-season tomatoes.
To get those extra weeks of production, you need to keep the air around your plants warm, even when the weather is cold, by using mulches, cloches, row covers, or cold frames.
Or give heat-loving crops (such as melons, peppers, and eggplants) an extra-early start by using two “blankets”—one to warm the air and one to warm the soil in early spring. About 6 to 8 weeks before the last frost date, preheat cold soil by covering it with either infrared-transmitting (IRT) mulch or black plastic, which will absorb heat. Then, cover the bed with a slitted, clear plastic tunnel. When the soil temperature reaches 18° to 21°C, set out plants and cover the black plastic mulch with straw to keep it from trapping too much heat. Remove the clear plastic tunnel when the air temperature warms and all danger of frost has passed. Install it again at the end of the season when temperatures cool.