How to Grow Shiso Plant Outdoors

Shiso, also known as Perilla, is a versatile and flavorful herb that is popular in Asian cuisine. It is commonly used in sushi, salads, and stir-fries for its unique taste and aromatic fragrance. Growing shiso outdoors allows you to have a fresh supply of this herb right in your backyard. In this article, we will guide you on how to successfully grow shiso plant outdoors.

Choosing the Right Location

Before planting shiso outdoors, it is essential to choose the right location for optimal growth. Shiso plants thrive in full sun but can tolerate partial shade. Look for an area in your garden that receives at least six hours of direct sunlight each day.

Ensure that the soil in the chosen location is well-draining and rich in organic matter. Shiso prefers slightly acidic to neutral soil with a pH range of 6.0 to 7.0. If your soil is heavy or clay-like, amend it with compost or well-rotted manure to improve drainage and fertility.

Starting from Seeds

Growing shiso from seeds is the most common method. The seeds are small and can be directly sown into the garden bed after the last frost date in your area.

1. Prepare the soil by removing any weeds or debris and loosening it with a garden fork or tiller.
2. Sow the shiso seeds directly onto the soil surface, spacing them about 12 inches apart.
3. Lightly cover the seeds with a thin layer of soil, approximately 1/8 inch deep.
4. Water gently to keep the soil moist but avoid overwatering, as excessive moisture can cause the seeds to rot.
5. Germination typically takes around 7 to 14 days. Once the seedlings have grown a few inches tall, thin them out, leaving the strongest ones with at least 12 inches of space between each plant.

Transplanting Seedlings

If you prefer to start your shiso plants indoors, you can sow the seeds in seed trays or pots about six weeks before the last frost. Once the danger of frost has passed, you can transplant the seedlings outdoors.

1. Harden off the seedlings by gradually exposing them to outdoor conditions over a period of one to two weeks. Start by placing them in a sheltered area for a few hours a day and gradually increase their exposure to sunlight and wind.
2. Choose a cloudy day or transplant in the early evening to minimize stress on the seedlings.
3. Dig a hole that is slightly larger than the root ball of each seedling.
4. Gently remove the seedlings from their containers, being careful not to damage the roots.
5. Place each seedling in a hole and backfill with soil, firming it gently around the roots.
6. Water thoroughly after transplanting to help settle the soil around the roots.

Caring for Shiso Plants

Shiso plants are relatively low-maintenance once established, but they still require proper care to thrive.

Watering

Keep the soil consistently moist but not waterlogged. Shiso plants prefer regular watering rather than drying out between watering sessions. Water deeply at least once a week, providing enough water to penetrate the root zone.

Fertilizing

To promote healthy growth, fertilize your shiso plants every four to six weeks during the growing season. Use a balanced organic fertilizer or compost tea according to package instructions. Avoid over-fertilizing, as this can lead to excessive leaf growth with reduced flavor.

Pruning

Regular pruning helps promote bushier growth and prevents shiso plants from becoming leggy. Pinch back young plants when they reach a height of 6 inches, removing the top set of leaves. This will encourage lateral branching and denser foliage.

Mulching

Applying a layer of organic mulch around the base of your shiso plants helps retain moisture, suppress weed growth, and maintain a more consistent soil temperature. Use organic materials such as straw, shredded bark, or compost. Apply a layer about 2 to 3 inches thick, ensuring that the mulch does not touch the stems directly.

Pests and Diseases

Shiso is generally resistant to common pests and diseases. However, occasional problems such as aphids, whiteflies, or snails may occur. Monitor your plants regularly and take appropriate action at the first sign of infestation. In most cases, hosing off the affected leaves with water or using organic insecticidal soap should suffice.

Harvesting Shiso

You can start harvesting shiso leaves once the plants have reached a height of 6 to 8 inches, typically around 40 to 60 days after planting. Harvesting is as simple as picking the leaves individually or cutting entire stems from the plant.

Regularly harvesting the leaves promotes new growth and encourages a bushier plant. You can harvest shiso throughout the growing season until the first frost arrives.

Conclusion

Growing shiso plant outdoors is a rewarding experience that allows you to enjoy its unique flavor and aroma straight from your garden. By choosing the right location, starting from seeds or seedlings, and providing proper care, you can cultivate healthy shiso plants that will provide you with a continuous supply of this versatile herb. So why not give it a try and add a fresh taste of Asia to your culinary adventures?