Reusable Pin Holders That Give You Control Over Every Stem

A flower frog is a weighted metal or ceramic holder with upright pins that anchor stems in place without foam. You push each stem onto the pins, and the frog holds it at the angle you choose. Harvest Moon Floral Art explains how this reusable tool works, when it gives you better control than other mechanics, and which arrangements benefit most from its precision.

What a flower frog looks like and how it works

The tool sits at the bottom of your container, hidden by water and stems. A flat base keeps it stable; short metal pins rise from the surface in a grid or radiating pattern. You press a stem down onto the pins, and they pierce the cut end to hold it upright. The weight of the base stops the frog from tipping when you add stems at an angle.

Most frogs are made from brass, lead or ceramic. Brass versions last decades and resist rust. Ceramic frogs are lighter but can chip if dropped. The pins are close enough together to grip thin stems, but spaced widely enough for thicker woody cuts to fit between them.

Common names for the same tool

You may see flower frogs called pin frogs, kenzan holders or simply kenzan. All refer to the same weighted holder with pins. The Japanese term kenzan is widely used in ikebana, where the tool originated, but the function remains identical across styles.

Advantages over floral foam

Foam dissolves with repeated use and ends up in landfill. A flower frog can be rinsed and used again for years. You also see exactly where each stem sits, which makes adjustments easier. Foam hides the mechanics, and once you pull a stem out, the hole remains.

Stems placed on a frog drink freely from the water around them. Foam holds water, but the stem must stay fully inserted to reach it. If you shift a stem in foam, it may lose contact with the moisture inside. With a frog, the stem end is always submerged.

Worth noting: foam gives you a larger surface area for dense, rounded arrangements. A frog works best when you want space between stems and deliberate angles. Read more about chicken wire as a reusable alternative that suits fuller designs.

Choosing the right size and shape for your container

Match the frog's diameter to the width of your container. A frog that covers roughly a third to half the base gives you enough pins to work with, without crowding the space. For a narrow vase, a small round frog works well. Wide, shallow bowls suit rectangular or larger circular frogs.

The weight matters. A heavier frog stays put when you press thick stems onto it. Light frogs can tip in tall containers if the arrangement becomes top-heavy. Check that the frog sits flat on the bottom; some bowls have uneven bases that cause the holder to rock.

Preparing stems to sit securely on the pins

Cut each stem at a sharp angle to create a pointed end. This helps the stem pierce onto the pins without slipping sideways. Woody stems may need a vertical slit up the centre to open the fibres and let the pins grip.

Remove leaves and side shoots from the lower part of the stem. Foliage trapped between the pins can rot in the water and make the frog harder to clean. A bare stem also shows you exactly where it sits, which matters when you are building a structure with deliberate spacing.

Arrangements that suit a flower frog best

Low, asymmetric designs with clear lines benefit from the precision a frog offers. You can angle each stem independently and see the effect before you move on to the next. Traditional ikebana arrangements rely on this control, but the same principle applies to any style where each stem plays a distinct role.

Frogs work well in transparent containers where the mechanics stay visible. The metal grid becomes part of the aesthetic, rather than something to hide. Shallow bowls and wide dishes suit frogs particularly well, because the short pins hold stems at low angles without tipping.

When foam or wire may serve you better

Dense, rounded bouquets with many thin stems often need more support than a single frog can give. Foam or a ball of chicken wire holds stems at every angle across the entire container. A frog is less suited to designs where stems must radiate from a central point in all directions.

Very soft or hollow stems can collapse when pressed onto pins. In those cases, a gentler support such as wire or a grid of tape across the vase opening may be kinder to the stems.

Securing the frog inside the container

A clean, dry base helps the frog stay in place. Wipe the inside of the container and the underside of the frog before you position it. Some frogs have a sticky pad on the base; press it down firmly and let it settle for a moment before adding water.

For extra security, use a small coil of florist's putty or a dab of waterproof adhesive under the frog. This is particularly useful in shallow dishes where a tall arrangement might shift the frog if knocked. Once the adhesive sets, the frog will not move until you deliberately lift it.

Cleaning and storing your frog between uses

Rinse the frog under warm water immediately after you dismantle an arrangement. Use a soft brush to remove any debris caught between the pins. Trapped organic matter can corrode metal over time, so a thorough rinse after each use keeps the pins sharp and rust-free.

Dry the frog completely before you store it. Stand it upright on a towel or leave it on a rack until all moisture evaporates. Store frogs in a dry drawer or box, separated from other tools so the pins do not catch on fabric or scratch surfaces.

Step-by-step guide to arranging with a flower frog

1. Place the frog in the centre or to one side of your container, depending on the design you want. Press it down firmly so it sits flat.
2. Fill the container with clean water until the pins are just covered. This lets you see the frog while you work, but keeps the stem ends submerged.
3. Start with the tallest or most structural stem. Push it onto the pins at the angle you need, adjusting until it feels stable.
4. Add supporting stems one at a time, working around the first. Turn the container as you go to check the balance from all sides.
5. Fill gaps with shorter or softer stems, using the frog's pins to hold each exactly where you place it. Step back between additions to assess the shape.
6. Top up the water once the arrangement is complete. The stems will drink steadily, and the water level can drop quickly in the first few hours.

Combining a frog with other mechanics

You can rest a small piece of chicken wire over a frog to create a hybrid support. The wire catches lighter stems that might slide off the pins, while the frog anchors thicker, structural stems. This approach suits arrangements that mix delicate and sturdy material.

In wide containers, two small frogs placed side by side give you more pins to work with. Position them slightly apart so you can angle stems between them. This method works well for horizontal designs where stems need to reach across the container rather than rise vertically.

Practical tips for working with heavy stems

Thick woody stems may need a heavier frog than you first expect. Test the stability by pressing the stem onto the pins and giving it a gentle push. If the frog tips or shifts, swap it for a larger or denser model before you continue.

Score the cut end of tough stems with a knife to help the pins penetrate. A single vertical cut down the centre often does the job. Avoid splitting the stem too far up, as this can weaken it and cause it to snap under its own weight.

For more on preparing woody stems, see our guide to safe stem preparation.

Where to find flower frogs and what to look for

Florist suppliers and online craft retailers stock frogs in various sizes and materials. Look for models with tightly spaced pins if you work mostly with fine stems, or wider spacing for thick cuts. Some suppliers sell sets with multiple sizes, which gives you flexibility as you try different containers and styles.

Second-hand frogs appear at antique markets and online auctions. Check that the pins are straight and intact, and that the base is not cracked. Brass frogs can be cleaned and polished back to working condition even if they look tarnished, but bent pins are hard to straighten without tools.

When a flower frog changes the way you arrange

Once you feel the control a frog gives you over each stem, many arrangers find themselves reaching for it more often than foam. The ability to adjust a stem without damaging the support or the stem itself makes the process more forgiving. You can experiment with angles, remove stems that do not work, and reposition them until the arrangement feels right.

The tool also encourages restraint. With limited pins, you consider each stem more carefully. This often leads to cleaner, more deliberate designs where every element has a reason to be there. If you are used to filling space with foam and many stems, working with a frog can feel like a shift toward simplicity and intention.