How to Grow and Care for Gloxinias - Dengarden - Home and Garden
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How to Grow and Care for Gloxinias

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I enjoy growing flowers and giving tips on how to care for them.

Gloxinias, or florist Gloxinias (Sinningia speciosa), are the most glorious summer and autumn flowering house plants.

Gloxinias, or florist Gloxinias (Sinningia speciosa), are the most glorious summer and autumn flowering house plants.

Gloxinias

The plants commonly known as Gloxinias, or perhaps florist Gloxinias, are mostly varieties of one species, Sinningia speciosa, which comes from Brazil.

The name Gloxinia was given in honour of Benjamin Peter Gloxin, a French botanical writer working at the end of the 18th century. The genus name honours Wilhelm Sinning, head gardener at the University of Bonn in the mid 19th century. He was associated with the hybridization and selection work which has given us one of the most glorious summer and autumn flowering house plants.

These modern hybrids have brilliantly colored trumpet-shaped flowers and very beautiful, large, flat and velvety mid-green leaves. The blooms vary in color from rich crimson, deep red, violet and white to various combinations of such colors. Some forms, called the tigrina gloxinias, have flowers heavily spotted or delicately veined in these colors on a white background, and others have frilled edges, touched with white.

Gloxinias can be grown from seed, cuttings or tubers in late winter/early spring, but they are fastidious plants, needing precise care and attention to grow and thrive. The tubers will survive from year to year but they should not be kept longer than two or three years as old plants tend to lose their vigour.

If bought in a flower, ensure that the plant has plenty of buds that have not yet opened. The leaves should not be torn or damaged and should be deep green—pale plants will have been underfed. Check that there is no rot anywhere on the plant, and take great care when transporting, for the fleshy leaves are delicate in structure and can easily break.

Proper Care Guide

Atmosphere: Gloxinias should be kept away from draughts.
Cleaning: Not necessary - the spraying will be enough (see Humidity below). Never use leaf shine.
Feeding: Add liquid food to the water every week when the flower buds start appearing.
Humidity: When the temperature rises above 75° F (24° C), mist-spray the air above the foliage with tepid water. Do not spray the foliage directly as drops of water will mark the leaves and flowers. To provide constant humidity, it is also a good idea to stand the pots on trays of moist pebbles or damp peat.

Light: Gloxinias require a very light position but need to be protected from full sunlight in the summer.

Potting and re-potting: Use a moist peat-based compost with a drainage layer of sharp sand, and pot up the dormant tubers once in late winter/early spring. Put each tuber singly into a 4-6 in (10-15 cm) pot, making sure that the upper surface of each tuber is level with the surface of the mixture. Water them sparingly at first, increasing the amounts gradually as the growth improves.

Young plants grown from seed or cuttings should be re-potted in pots which are one size larger as soon as the old pot fills with roots - about 2 or 3 times during the growing season. After re-potting, leave plants in the shade without water for 2 days to encourage the roots to grow into the new compost.

Propagation: Use 2-3 in (5-7 cm) long stem cuttings taken from old tubers started into growth in spring. Take each cutting in early summer, and put it in a 1-2 in (3-5 cm) pot of moistened potting mixture. Enclose the hole in a plastic bag or propagating case, and stand it in bright filtered light for about 4-6 weeks, when renewed growth should indicate that a tuber and roots have already formed.

Uncover the young plants only slightly at first, and remove it from the protected atmosphere gradually over a 4-week period, keeping the potting mixture moist. Thereafter, treat the rooted cutting as recommended for a mature plant.

Old tubers can also be cut into pieces, each with a growing point (see right).

All Sinningia speciosas can also be grown from seed sown in early spring or leaf cuttings taken when the leaves are mature in summer (see right). Be careful that the young plants do not rot through over-watering and poor ventilation. Seeds and cuttings of whichever type will root at 70° F (21° C).

Pruning: You can remove the dead flowers and damaged leaves whenever convenient.

Temperature: Actively growing Sinningias will do well in temperatures between 60-75° F (15-24° C), but they need adequate humidity (see above). In winter the dormant tubers should be kept dry and frost-free. They require a high temperature of 70° F (21° C) to start them growing in late winter or early spring.

Water: Give plenty of water, 2-3 times a week in summer, but never let pots stand in water. Water at the edge of the pot to keep it off the leaves and flowers. As dormancy approaches and leaf color fades, gradually reduce amounts of water until stems die down. Leave dormant tubers completely dry.

What Goes Wrong

ProblemCauseTreatment

Pale green leaves

Needs feeding

Add liquid food to the water

Brown rings on leaves

Tomato spotted wilt virus

No cure: destroy plant

Leaves distorted and sticky with green insects

Greenfly

Spray with pyrethrum or a systemic insecticide

Leaves curl

Too sunny

Move to a partially shaded place

Stems or buds rot

Too cold and water remaining on the plant after watering

Move to warmer place and take care that water does not stay on leaves and buds after watering or spraying

Stained flowers

Marked by water

Avoid spraying flowers

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

Comments

Isabel on July 22, 2019:

They do not die, they form a "bulb" and remain dormant in winter.They come back in spring.You can keep the in the house or in the garage. Keep away from rodents.

brianmolo2@gmail.com on November 28, 2018:

My gloxinia bulb is still not germinating after 3 months in the soil. What is wrong?

Susan on September 27, 2017:

Received seeds from Arboredum last spring and spread seeds. Surprised to see the pretty little flowers blooming in corner of big flower pot of with bonsai cut bush/ground cover. Hope it continues to spread.

Lin on July 20, 2017:

Ive had a red Gloxinia for 3 years now, but i must remember to feed it when in bud .

Louise on July 18, 2017:

Does anyone out there know how to straighten a cactus plant? I put it in the sun thought it might work but nothing so far.Its healthy and has nice babies but i'm afraid its going to fall over. Can anyone help?

Deb on July 11, 2017:

Hi I have a gloxinia which is 18 years old & its still going strong, at the moment it has 6 flowers & 7 buds waiting to flower..i did read somewhere that you should discard them after 2/3 years but disagree with that..

Nanny MC.Phee on May 05, 2017:

My gloxinia has gone leggy and pale in colour, I didn't leave the plant dormant after it stopped flowering. Please can you advise me.Thank you.

VioletQueen on December 21, 2016:

So, after flowering, cut back watering and let the tuber go dormant? How long? Will the tuber re-flower year after year or do you slice it to make new plants? So many questions??

debbie on October 18, 2016:

when my plants become leggy are they not getting enough light? How long does it take for a tuber to grow when grown from seed?

EDITH on September 12, 2016:

I PLANTED THREE TUBERS IN THE SPRING. TWO GREW BUT THE PLANTS ARE VERY LEGGY! WHAT HAVE i done wring?

Judy on August 06, 2016:

Can I leave them in my garden through the winter? I live in zone 5. Thanks

Mary on February 08, 2015:

I've been raising gloxinia's for yr's my older plants winter just fine,last yr. i took some leaf cuttings from the store [ wanted more colors ] rooted them planted and they blossomed beautifully,when they went to rest i waited about 3 months when i didn't see growth i dumped the soil they were soft or dry rotted, i use african violet soil because there from the same family and its good soil, did the bulbs go bad because there grown by florist in greenhouses or whats my problem?

craftybegonia from Southwestern, United States on January 03, 2011:

Thanks for the hub. Gloxinias are really beautiful. I love their velvety texture! We had some and they were very pretty for a little bit and then they died. I think they are too delicate for our gardening skills.

Holle Abee from Georgia on November 16, 2009:

I love glox, but I've never had much luck with them. Maybe I'll try again now!