Oh, Delphiniums! Aren’t they just a sight for sore eyes? Those tall, elegant spires of brilliant blue, purple, pink, and white are the crown jewels of so many summer gardens. They bring such a wow factor, don’t they? And you know what’s even more rewarding than admiring them? Growing them yourself from a tiny cutting or a division! If you’ve ever dreamed of filling your garden with more of these beauties, or sharing them with friends, propagating Delphinium anthriscifolium is where it’s at. Now, I’ll be honest, Delphiniums can be a little fussy sometimes, but don’t let that deter you. With a bit of know-how and patience, you absolutely can succeed.
The Best Time to Start
For Delphinium anthriscifolium, the sweet spot for propagation is typically late spring to early summer. This is when the plant is actively growing, and you can usually find nice, healthy new shoots emerging from the base or along the main stems. These young, vigorous pieces are much more inclined to root than older, woody material. You can also divide established plants in early spring, just as they are waking up from winter dormancy.
Supplies You’ll Need
Gathering your supplies before you begin will make the whole process so much smoother. Here’s what I always have on hand:
- Sharp, clean pruning shears or a sharp knife: Essential for clean cuts that heal well.
- A good quality potting mix: I prefer a light, well-draining mix. A blend of peat moss or coco coir, perlite, and a bit of compost works wonders.
- Rooting hormone (optional, but recommended): This can significantly boost your success rate, especially with cuttings.
- Small pots or trays with drainage holes: Whatever you choose, make sure they can drain freely to prevent soggy roots.
- A spray bottle filled with water: For misting your cuttings.
- Plastic bags or a clear propagating lid: To create a humid environment.
- A dibber or pencil: For making planting holes.
- For division: A garden fork or a spade.
Propagation Methods
Delphiniums are surprisingly amenable to a couple of popular propagation techniques. Let’s dive in!
Stem Cuttings
This is a fantastic way to get new plants when you have a healthy, established Delphinium.
- Take your cuttings: Choose a healthy stem that’s about 4-6 inches long. Look for a stem with new growth, not woody older material. Make a clean cut just below a leaf node (where a leaf joins the stem). This is where the magic happens, as high concentrations of rooting hormones are often found here.
- Prepare the cuttings: Gently remove the lower leaves from the cutting, leaving just a few at the top. If the remaining leaves are large, you can cut them in half horizontally to reduce water loss through transpiration.
- Apply rooting hormone: Dip the cut end of the stem into your rooting hormone powder or gel. Tap off any excess.
- Plant your cuttings: Fill your small pots with your prepared potting mix. Use your dibber or pencil to make a hole in the soil, then carefully insert the cutting. Gently firm the soil around the base.
- Water and cover: Water the cuttings gently until the soil is moist but not waterlogged. Cover the pot with a plastic bag or a clear lid to create a mini-greenhouse effect. This maintains high humidity, which is crucial for cuttings.
Division
This is best done in early spring, as soon as you see new growth emerging.
- Gently excavate: Carefully dig around the base of your established Delphinium plant. The goal is to loosen the root ball without causing too much damage.
- Separate the divisions: Once you can see the main clump, use your hands or a sharp spade to gently pull or cut the root ball apart. Aim for divisions that have at least one or two healthy shoots and a good amount of root attached.
- Replant immediately: Plant your divisions directly into their new positions in the garden or into pots filled with good potting mix. Water them thoroughly.
The “Secret Sauce” (Pro Tips)
Here are a couple of things I’ve learned over the years that can really make a difference:
- Don’t let the leaves touch the water: If you’re doing water propagation (which is less common for Delphiniums but possible with very soft new growth), it’s crucial that no leaves are submerged in the water. Rot sets in fast if leaves are left in standing water.
- Bottom heat is your friend: For stem cuttings, placing your pots on a gentle heat mat can considerably speed up root development. It mimics the warmth of spring and encourages those roots to get going.
Aftercare & Troubleshooting
Once your cuttings have settled in or your divisions are planted, it’s time to give them a bit of care.
Keep the soil consistently moist but not soggy. Mist the leaves of your cuttings regularly, especially if you’re not using a humidity dome, to keep them from drying out. Place them in a spot with bright, indirect light. Avoid direct sun, which can scorch tender new growth.
Be patient! Root development can take anywhere from a few weeks to a couple of months. You’ll know your cuttings have rooted when you see new leaf growth appearing. You can also give a very gentle tug – if there’s resistance, roots are forming!
The most common problem you’ll encounter is rot. This is usually a sign of overwatering or poor drainage. If you see your cuttings wilting and turning mushy, or if the soil stays waterlogged for too long, rot is likely the culprit. Discard any affected cuttings and ensure your soil mix is airy and your pots have excellent drainage. For divisions, if they seem to be struggling after planting, ensure they are getting adequate water and aren’t exposed to harsh conditions.
A Little Patience Goes a Long Way
Growing Delphiniums from cuttings or divisions is a journey, not a race. There will be times when it feels like nothing is happening, but trust me, those roots are working hard beneath the surface. Enjoy the process of nurturing these new plants, and soon enough, you’ll be rewarded with their spectacular blooms. Happy gardening!
Resource:
https://identify.plantnet.org/k-world-flora/species/Delphinium%20anthriscifolium%20Hance/data