What Is a Kenzan? How to Choose, Use and Care for a Japanese Flower Holder
Sep 13, 2026
Quick answer: a kenzan is a Japanese pin holder used to secure flower stems and branches in a vessel. In English, it is often described as a flower frog. The pins hold the material in place so you can control the direction, height and angle of an arrangement.
If you are new to ikebana, the main choice is not simply “small or large.” Choose a kenzan that is stable enough for the plant material you want to use, fits the vessel securely, and suits the way the arrangement will be built.
Kenzan vs flower frog: are they the same thing?
A kenzan is one type of flower frog. “Flower frog” is a broader English term for devices that hold flower stems in position. A kenzan is the Japanese pin-bed form: a base covered with closely spaced upright pins.
In ikebana it is a type of hana-dome, or flower holder. The stem is pressed onto the pins while the base sits inside the vessel, allowing the arranger to position material deliberately rather than letting stems rest loose in the container.
The name kenzan is commonly translated as “sword mountain,” a reference to the bed of upright pins.
What does a kenzan actually do?
A kenzan gives the arranger control. Stems can be kept upright, leaned to one side or positioned at deliberate angles while the mechanics remain low in the vessel.
It is especially useful in shallow or wide-mouthed vessels, where the mouth of the container itself does little to support the flowers. It can also be used outside formal ikebana whenever you want a reusable pin holder instead of letting stems float freely in a vase.
If you are deciding between a pin holder and floral foam rather than between kenzan sizes, read Kenzan vs Floral Foam: What Is the Difference? for the differences in stem support, water, reuse and design control.
How to choose a kenzan for your vase and flowers
Think about four things together:
- the weight and stiffness of the plant material;
- the size and shape of the vessel;
- how much flat surface the kenzan has to sit on;
- how much open visual space you want around the arrangement.
A larger or heavier kenzan generally gives more stability for taller, heavier or woody material. A smaller one takes up less room and can be enough for lighter stems or compact arrangements. The important point is stability: a heavy branch in a narrow vessel can demand more support than several soft flowers in a wider container.
For a step-by-step sizing method using vessel floor, plant weight and stability, read How Do I Choose the Right Kenzan Size for My Vase?.
Traditional weighted kenzan
A traditional metal kenzan relies on its own weight to stay steady. This is a strong general-purpose choice for shallow-vessel arranging and for material that benefits from a firm base.
Our HANAKATSU Kenzan uses brass pins in a weighted base with a soft elastomer underside. It is currently available in 61 mm, 80 mm and 90 mm sizes.
Lightweight suction-cup kenzan
A lightweight kenzan behaves differently because it does not rely on mass alone. The AIRIN Lightweight Kenzan uses a light body with a suction cup, so the vessel surface becomes part of the choice.
This works best when the suction cup can attach securely to a suitable smooth surface. It should not be treated as a direct substitute for a heavy metal kenzan in every arrangement.
Mini kenzan
For a single flower, a tiny vessel or several separate points of support, a full-size kenzan can be unnecessary. The HANAKATSU Mini Kenzan Set contains four small weighted pieces—two round and two square—for compact arrangements and small placements.
How to use a kenzan
The basic technique is simple, and Ikenobo’s own guidance follows the same sequence: seat the material securely first, then change the angle.
- Choose a suitable vessel. A shallow or wide-mouthed vessel makes the kenzan easy to position and gives you room to control the stems.
- Place the kenzan carefully. Metal kenzan are heavy and the pins are sharp, so lower the tool into the vessel instead of dropping it.
- Add water. A practical starting point is for the water to sit a little above the pin bed. If the vessel is deep, you can add more water after the arrangement is stable.
- Prepare the stem. Cut the material cleanly so it can seat on the pins without unnecessary crushing.
- Insert the stem vertically first. Press it firmly onto the pins so it is securely held.
- Then adjust the angle. Once the stem is seated, gently lean it toward the direction required by the arrangement.
The important motion is insert first, then angle. Trying to push a stem sideways across the pins before it is seated can make placement harder and less controlled.
Can a kenzan damage a vase?
A metal kenzan is hard, heavy and pointed, so care is sensible with delicate vessels. A rubber or elastomer guard can reduce slipping and help protect the base, but you should still place the kenzan gently rather than dragging it across the vessel.
Ikenobo also advises using protection underneath a metal kenzan when the vessel could be scratched. The HANAKATSU models in our range already have a soft elastomer underside. AIRIN uses a suction cup and a lightweight body, so it interacts with the vessel differently.
How to clean and care for a kenzan
Plant fibres, leaves and pieces of stem can become trapped between the pins. After arranging:
- rinse the kenzan under running water;
- remove trapped plant material with a thin stick, bamboo skewer or suitable kenzan brush;
- allow it to dry before storage;
- handle the pins carefully when lifting and cleaning the tool.
Brass pins can bend after long use. A suitable kenzan-straightening tool can be used to realign them rather than pulling them roughly by hand.
Which kenzan should a beginner choose?
For most beginners, the decision can be kept simple:
- Choose a weighted HANAKATSU Kenzan if you want the familiar traditional form for shallow-vessel arranging and general use.
- Choose AIRIN if you specifically want a very lightweight holder with suction attachment and have a suitable smooth vessel surface.
- Choose the Mini Kenzan Set for tiny containers, single flowers or several small placements.
You can compare the current options in our Japanese Kenzan & Ikebana collection, where the size, form and use cases are shown side by side.
Is the kenzan an ancient ikebana tool?
Ikebana is much older than the familiar modern pin-bed kenzan. Japanese flower arrangers used several kinds of flower-holding methods and tools before the many-pin form became common.
Research published by Japan’s Agency for Cultural Affairs describes earlier flower holders and notes that the modern form with many bundled pins appeared during the Meiji period. Its convenience helped it spread widely. That distinction is useful: the tradition of ikebana is centuries old, while the pin-bed kenzan is a comparatively modern tool within that tradition.
Frequently asked questions
Is a kenzan the same as a flower frog?
A kenzan is a type of flower frog. “Flower frog” is the broader English category; kenzan refers specifically to the Japanese pin-holder form.
What size kenzan should I buy?
Choose according to the scale and weight of the arrangement, the vessel and the amount of flat base available. Heavier or taller material generally benefits from a larger, more stable kenzan.
How do I use a kenzan?
Place it securely in the vessel, add water, press the prepared stem vertically onto the pins until it is held firmly, then adjust the stem to the angle you want.
Should the kenzan be covered with water?
A useful starting point is for the water to sit just above the pin bed so the cut stems can reach water without making insertion unnecessarily difficult.
Can a kenzan scratch a vase?
Yes, a heavy metal kenzan can mark a delicate surface if it is dragged or dropped. Use a protective underside or guard and place it gently.
Weighted kenzan or suction kenzan?
A weighted metal kenzan relies on mass for stability. A suction model relies more on the surface of the vessel and the quality of the suction attachment. Choose according to the vessel and the material you intend to arrange.
Can I use a kenzan for ordinary flower arranging?
Yes. The underlying function is simply to hold stems securely and let you control their position. It can be useful for everyday flower arranging as well as for the study and practice of ikebana.
Explore the tools around the arrangement
Compare the current Kenzan & Ikebana range, pair your arrangement with Japanese Flower & Florist Scissors, or read our guide to Flower Scissors, Secateurs and Ikenobo Scissors.
Sources and further reading
For practical placement, handling and care, see Ikenobo’s official guide to using a kenzan. For the historical distinction between earlier Japanese flower holders and the modern pin-bed kenzan, see the Japan Agency for Cultural Affairs research.
