Agricultural tools have been refined for hundreds of years, hence the towering sunflowers found in Japanese kitchen gardens. Sunflowers serve to structure the area and help organize a diverse ecosystem by providing microclimates — they are not there just for decoration!
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The first gardeners in the world to discover that sunflowers were useful for creating garden ecosystems were the Japanese. Sunflowers provide 8 benefits that create remarkable ecosystems in ordinary gardens.
1. Natural Windbreak Systems for All Plants
Farmers in Japan also utilize sunflowers that are planted along the borders of their fields. When planted in rows instead of solid barriers, sunflowers form a natural wind break and help to reduce soil erosion. Sunflowers reduce soil erosion even more than solid barriers because the flower heads break the wind, while the tap roots hold soil in place.
For optimal results, try planting your sunflowers in a zig-zag formation and spaced 18 inches apart. Instead of a solid wall, wind will flow and pass through your sunflowers at a lower speed. This method can reduce wind speed by 60% at a distance of 10 times the height of your sunflowers.
2. Climbing Living Support Systems for Crops
Japanese gardening traditions involve planting beans, cucumbers, and morning glories alongside sunflowers. Since morning glories and cucumbers require an external support structure, they take advantage of sunflower stalks by using them as trellises. As sunflowers can hold 15 pounds of weight per stalk, they provide excellent support for climbing crops.
The roots of sunflowers benefit soil structure which provides support for climbing plants. This form of companion planting uses vertical space and increases productivity. Additionally, the differing heights creates more visual interest.
3. Pest Be Gone: Effective Targeted Pest Deterrence
The roots and leaves of sunflowers contain chemical compounds that deter aphids, squash bugs, and cucumber beetles. Therefore, Japanese gardeners use companion planting with sunflowers around eggplant and pepper crops.
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The flowers attract predatory insects that are helpful such as lacewings and ladybugs, who help control the populations of destructive insects. This makes it possible to use the biological method in the garden season after season.
4. Pollinator Highways That Increase All Yields
Japanese sunflowers encourage pollinators like bees and butterflies to visit your garden and help the neighborhood pollinators in their important work. The broad flower heads act as both fueling stations and landing spots. Sunflowers will keep your pollinators working longer.
I can provide a restatement for you: Pollinators' activity results in an increase in fruit production for adjacent crops. When sunflowers border the garden, increased pollinator activity results in a 40% increase in the yield of tomatoes, peppers, and squash relative to gardens that do not have sunflowers.
5. Factories in the Underground Soil Amendments Sector.
Some roots of sunflowers may penetrate as deep as six feet. Sunflowers can fracture dense and tough soil layers and retrieve essential nutrients and minerals from considerable depths. When the season ends, decomposting plants create a supply of fresh organic matter in the soil throughout the whole garden.
Japanese farmers employ sunflowers because the sunflowers retrieve phosphorus from deeper soil layers inaccessible to other plants. Because of natural fertilizer systems, less external soil amendments are needed and long-term soil health is created.
6. Sensitive plants can be created microclimates.
Sunflowers provide shade as well as help create microclimates that are beneficial to cool-season sensitive crops like lettuce and spinach. These crops require specific protection from the sun at certain times. Sunflowers change the protective pattern by providing morning sun and afternoon shade.
The natural air conditioning is the only thing that causes this effect. Additionally, it protects plants from heat-stress and prolongs the growing season of cool-weather crops. The shaded areas of the sunflowers are 5-10 degrees cooler.
7. Integrating wildlife helps increase levels of biodiversity.
Gardens in Japan attract many kinds of animals. The edges of the gardens have sunflowers that form passages for animals to travel between different zones. The tall stalks of sunflowers are great for birds to hunt, and the area at the bottom of the stalks is a great hiding place for small mammals.
The garden’s diverse wildlife creates a predator/prey balance that keeps pest populations in check. Increased biodiversity from sunflower borders can even be said to increase the productivity and resilience of the garden.
8. Winter and Holiday Decor
In the philosophy of Japanese gardens, the elements of summer are equally important as those of winter. In winter, sunflowers transform into standing stalks that create habitats to attract winter wildlife.
This process will repeat. The decayed stems and soil will be cut and combined with decayed stems. In the spring, the decayed stems can be cut and mixed with decayed stems and soil. Some birds that remain in the area will eat from the seed heads while the birds migrate for the winter.
If you want to make a Japanese inspired Sunflower Border, you will need to find suitable Japanese Varieties for your climate zone. Most Traditional Japanese Varieties are good for zones 4-10, so they are usable for the majority of North America. These should go 1.5 feet apart at the edges of your garden, and as you companion plant with beans or cucumbers, you will probably see your garden becoming a self sustaining ecosystem.
