What a glass flower frog does
The frog is weight and geometry. A disc of pressed glass 2.5–5 in (6–13 cm) across, with nine to twenty holes, sits in water at the bottom of a bowl; each stem drops through a hole and stands at the angle the hole gives it. The mass of the glass keeps the arrangement from tipping. Domed versions, sometimes called hedgehogs, hold stems at more angles; cage frogs of wire or glass bars suit soft stems; the pin frog, the Japanese kenzan, is a brass base with needles and holds woody branches that a glass frog cannot.
Pressed glass frogs were made in clear glass and in green, pink and amber, and the colored ones are associated in the trade with the 1920s and 1930s. The moulds outlived the decade, reproductions are common, and a frog carries no mark in most cases. Describe a frog by form, color, diameter and condition, and leave the date to a documented example. Our catalogue of vintage flower frogs follows that rule, as it does for every object.
Using a flower frog in a shallow bowl
Choose a bowl 2–3 in (5–8 cm) deep whose base is a third larger than the frog, set the frog in, and add water to cover it. Cut stems to one and a half or two times the height of the bowl and strip the leaves that would sit under water. Place the heavy stems first through the center holes, then the lighter ones at the outer holes, angled outward. Three stems can make an arrangement; twelve fill a 12 in (30 cm) bowl. Change the water every two days and the frog keeps the composition in place.
The French country table takes to this method. A faience soup tureen lid, a copper gratin dish or a shallow pressed-glass bowl becomes the vase, and garden flowers with short stems finally find a use. Pitchers remain the vessel for tall stems, as the pitchers and teapots catalogue shows; ceramic bowls and vases for the same job are in the vases and ceramics catalogue. The French country accents guide places a low arrangement on a sideboard and a kitchen table.
Checks and cleaning
Hold the frog to the light and look at each hole: chips at the hole edges are sharp and cut stems, and a crack between two holes will spread. Check the base for a wear ring, which suggests use but not age, and the dome for internal fractures. Colored glass fades in strong sun over years; a frog that is paler on one side has stood in a window. Weight is the practical test: a frog that slides in the bowl is too light for the stems it carries.
Clean with warm water and a soft brush through each hole; mineral deposits lift with a soak in water and a splash of white vinegar. Keep old glass out of the dishwasher and away from hot water in a cold piece. The Canadian Conservation Institute’s guidance on glass objects applies here as it does to a stem glass: no thermal shock, no abrasives, dry fully before storage. Store frogs flat in a drawer, not stacked, and the holes stay intact.
What to compare
| Form | Suggested Use | Decisive Check |
|---|---|---|
| Disc frog with 12–16 holes | Low arrangements on a table | Chips at the hole edges |
| Domed hedgehog frog | Taller stems in a kitchen pitcher | Base stability and internal cracks |
| Pin frog, the kenzan | Branches and heavy stems | Pin corrosion and weight |
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Frequently asked questions
What is a glass flower frog used for?
It holds flower stems upright in a shallow bowl. The frog is a heavy pierced glass disc or dome that sits under the water; each stem passes through a hole and stands at the angle the hole gives it. It replaces floral foam, can be reused for decades, and turns a soup plate or a faience dish into a vase for short garden flowers.
How do I keep a flower frog from sliding in the bowl?
Use a frog heavy enough for the stems and a bowl whose base is a little wider than the frog, so it sits flat. Place the heaviest stems through the center holes first and angle the light ones outward to balance the weight. A small ring of florist putty under the frog holds it on a glazed base if needed.
Are glass flower frogs still made?
Yes. The form has been pressed in glass for a century, old moulds were reused for decades, and new frogs in clear and colored glass are sold today. A frog rarely carries a mark, so describe it by form, color, diameter and condition rather than by a date, unless a documented example or a dated box supports the attribution.
How do I clean an old glass flower frog?
Soak it in warm water, brush each hole with a soft brush, and lift mineral deposits with a splash of white vinegar in the water. Rinse, dry fully and store it flat. Keep old glass out of the dishwasher and avoid pouring hot water onto a cold frog, which can crack the glass between the holes.
Sources & further reading
- Canadian Conservation Institute — Caring for ceramic and glass objects — Supports gentle cleaning of glass objects without thermal shock or abrasives and dry storage.
