Multiply the Magic: Propagating Your Very Own Himalayan Bistort
Himalayan Bistort (Bistorta affinis), also known as knotweed, is a landscaping favorite thanks to its low-maintenance nature and vibrant pink flower spikes that grace gardens from summer into fall. While you can certainly purchase this groundcover at your local nursery, propagating your own Bistorta affinis is surprisingly simple and allows you to expand your existing patch or share the joy with friends. Let’s explore the two main methods:
1. Division: The “Set it and Forget it” Approach
Division is the easiest and quickest way to multiply your Bistorta affinis, offering almost guaranteed success. The best time for this method is during spring or fall, when the plant is dormant or just beginning to emerge from its winter slumber.
Here’s how:
- Dig it up: Using a sharp spade or garden fork, carefully lift a section of established Bistorta affinis from the ground. Aim for a section with healthy roots and shoots.
- Divide and conquer: Gently pull apart the clump with your hands, separating it into smaller sections. Each section should have a good amount of roots and at least one healthy shoot.
- Replant and rejoice: Replant your divisions at the same depth they were originally growing, ensuring the soil is loose and well-draining. Water them in thoroughly and watch them flourish!
2. Growing from Seed: The “Patience is a Virtue” Method
Propagating Bistorta affinis from seed requires a bit more patience, but it can be a rewarding experience. Here’s how:
- Seed collection: In late summer or early fall, you’ll notice the flower spikes developing small, dry seed heads. Collect these once they’ve turned brown and begin to open.
- Cold stratification: Bistorta affinis seeds benefit from cold stratification, mimicking the natural winter conditions they need to germinate. You can do this by sowing seeds in a seed tray filled with moist seed-starting mix, then placing the tray in a refrigerator (around 40°F) for 4-6 weeks.
- Time to sow: After stratification, remove the seed tray from the refrigerator and place it in a bright, warm location (around 70°F) but out of direct sunlight. Keep the soil consistently moist but not waterlogged.
- Germination and growth: Germination can take anywhere from 2-8 weeks, so don’t despair if you don’t see sprouts immediately. Once seedlings emerge and have developed a few sets of true leaves, you can transplant them into individual pots or directly into your garden after the last frost has passed.
Bistorta Affinis: A Propagation Dream
Whether you choose division for quick results or the rewarding journey of growing from seed, propagating your own Bistorta affinis is easier than you think. This resilient plant is a joy to have in any garden, and with these simple techniques, you can create a breathtaking display of cascading pink blooms that will bring lasting beauty to your outdoor space. So go forth, propagate, and let the magic of Bistorta affinis multiply!