Propagation guide

How to propagate Good King Henry (Blitum bonus-henricus) — step by step

Also called Good King Henry, Mercury, Wild Spinach.

The best way to propagate good king henry

The reliable, beginner-friendly way to propagate good king henry is softwood tip cuttings in water or soil. It suits this species because of how it grows: clump-forming herbaceous perennial with a deep taproot, arrow- to triangular-shaped dark green leaves on upright stalks, and slender greenish flower spikes; dies back in winter and re-emerges in spring.. From seed sown in spring (germination is slow and benefits from soaking), or by division of established crowns in spring or autumn. Self-sows modestly once established.

For the wider picture of which technique suits which plant, our guide to plant propagation methods compares water, soil, leaf, division and offset propagation side by side.

Step-by-step: propagating good king henry

Take a tip cutting. Snip a 10–15 cm, non-flowering tip from healthy good king henry, cutting just below a leaf pair with clean scissors.
Strip the lower third. Pinch off the leaves on the bottom third of the stem and remove any flower buds — energy needs to go into roots, not blooms.
Root it. Stand the bare stem in water on a bright windowsill, or push it into moist seed compost and cover with a clear bag or dome to hold humidity.
Watch for roots. Roots show in 1–3 weeks. For woodier herbs like rosemary, sage and lavender, soil rooting under a dome is more reliable than water.
Pot on. Once roots are 2–3 cm, pot into rich, moisture-retentive loam and pinch the growing tip to encourage a bushy good king henry.

The alternative method

If the main route does not suit your plant or setup, direct-to-soil cuttings under a humidity dome is the next best option for good king henry. Skip the water glass and root several cuttings directly in gritty seed compost under a clear dome — this is the more reliable route for woody Mediterranean herbs that sulk in water.

Timeline to roots

Realistically: roots in 1–3 weeks; pot up at 3–4 weeks. These numbers assume spring or summer warmth and bright indirect light. In a cold, dark room — or in winter dormancy — the same good king henry propagation can take twice as long or stall completely, so do not panic if progress looks slow out of season. Patience beats poking: disturbing a forming root system to “check” on it is a common way to set it back.

Common failure points

Leaving flower buds on the cutting — it spends energy blooming instead of rooting.
Water-rooting woody herbs (rosemary, lavender, sage): they root far better in gritty soil under a dome.
Letting the cutting wilt before it roots — high humidity (a bag or dome) is what carries it through.
Propagating off a stressed, pest-ridden or recently-repotted good king henry — always take material from a healthy, established parent.

When to do it

The best window is spring through late summer. Propagation is energetically expensive for a plant, and it only has the spare resources to build new roots when it is already growing actively, warm and well-lit. Out-of-season attempts are not pointless, but expect lower success and a longer wait.

Aftercare

For the first two to three weeks after potting, keep the new good king henry slightly moister than you would a mature plant and out of direct sun while the young roots adapt from water (or cutting medium) to soil. Hold off all fertiliser until you see a flush of new top growth — feeding a rootless cutting only burns it. Match the parent's needs as the new good king henry settles: Part shade to full sun. Unusually shade-tolerant for a leaf crop, it grows well in dappled or partial shade and appreciates protection from the hottest sun, which can scorch leaves.

Good King Henry propagation — frequently asked questions

What is the best way to propagate good king henry?

Softwood tip cuttings in water or soil is the most reliable method for good king henry. Propagate good king henry from a 4–6 inch softwood tip cutting. Strip the lower leaves, then root the bare stem in water or moist potting mix in bright indirect light. Roots form in 1–3 weeks and the cutting is ready to pot on at 3–4 weeks. Spring and summer are fastest.

Do you need a node to propagate good king henry?

For good king henry the rooting structure is softwood tip cuttings in water or soil, so a classic "node" matters less than starting with the right plant material — Strip the lower leaves, then root the bare stem in water or moist potting mix in bright indirect light.

How long does it take good king henry to root?

Roots in 1–3 weeks; pot up at 3–4 weeks. Timing varies with warmth and light — propagations move fastest in spring and summer when the plant is in active growth, and can stall almost completely in a cold, dark winter.

What is the best time of year to propagate good king henry?

Spring through late summer. Root and shoot development is metabolically demanding, so propagating during the active growing season gives noticeably higher success rates and faster results than attempting it in dormancy.

Can you propagate good king henry in water?

Yes — good king henry roots readily in a glass of water as long as a node is submerged. Water propagation is the most beginner-friendly route; just move the cutting to soil before the water roots get long and brittle (around 3–5 cm).