Everything You Need to Know About Begonia — Care, Planting & More
One of the largest and most diverse plant genera on Earth, begonias offer everything from painted-glass rex foliage to polka-dotted angel wings to tough-as-nails wax bedding flowers — and the Philippi...
About Begonia
One of the largest and most diverse plant genera on Earth, begonias offer everything from painted-gl...
Begonia is a staggeringly diverse genus — with over 2,000 recognized species, it is one of the largest genera of flowering plants on Earth, exceeded in number only by a handful of other mega-genera like Astragalus and Bulbophyllum. This immense diversity means begonias come in forms so varied they can barely be recognized as relatives: from compact, waxy-leaved bedding plants that bloom in full sun, to ethereal rex begonias with leaves that look as though they were painted by an artist with metallic and jewel-toned pigments, to towering cane begonias with bamboo-like stems, polka-dotted foliage, and cascading flower clusters. No single ornamental genus offers such breadth of form, texture, color, and growing habit.
Begonias belong to the family Begoniaceae and are distributed throughout tropical and subtropical regions worldwide, with centers of diversity in Central and South America, Southeast Asia, and central Africa. The genus is divided into several horticultural groups based on root structure and growth habit. Fibrous-rooted begonias (including the ubiquitous wax begonia, B. semperflorens) produce fine, fibrous root systems and are the toughest, most sun-tolerant types. Rhizomatous begonias (including rex begonias, B. rex-cultorum) grow from thick horizontal rhizomes and are prized for their spectacular foliage. Cane-stemmed begonias (including the viral polka dot begonia, B. maculata) produce tall, jointed stems reminiscent of bamboo. Tuberous begonias grow from underground tubers and produce the largest, most rose-like flowers but are poorly suited to Philippine lowland heat.
The genus Begonia was named by Charles Plumier in 1700 in honor of Michel Begon, a French colonial governor and plant enthusiast. European botanical exploration during the 18th and 19th centuries brought hundreds of begonia species from tropical regions into European greenhouses, where hybridization began almost immediately.
How to Plant Begonias in the Philippines
Soil, spacing, and the best planting approach for Philippine conditions.
Begonias are widely available across the Philippines. Wax begonias (50-150 pesos) are found at virtually every garden center and weekend tiangge. Rex begonias (150-500 pesos) are available at plant shops and from online collectors. Cane types including the popular B. maculata (100-800 pesos) are stocked by most plant sellers. Rare native Philippine species (500-5,000+ pesos) circulate through collector groups and specialty sellers. Facebook plant groups are the primary marketplace for rare and collector begonias.
Care Guide
Keep your Begonia healthy and thriving.
Bright indirect to partial shade — the specific requirement varies by type. Rex begonias need the most shade: bright ambient light without any direct sun (which burns their delicate, textured leaves).
Moderate — let the top 2-3 cm of soil dry slightly between waterings, then water thoroughly. Begonias occupy a middle ground: they need regular moisture but rot quickly in waterlogged soil.
Light, well-draining, slightly acidic. pH 5.5-6.5. Begonia roots are fine and fibrous, demanding excellent aeration — they suffocate and rot in dense, heavy soil. The ideal mix: coco peat + perlite + orchid bark (2:1:1).
Begonias thrive in humidity of 50-80% — and Philippine ambient humidity (65-85%) naturally provides this, giving Filipino growers a significant advantage over temperate growers who struggle to maintain adequate humidity.
Moderate feeder. Apply balanced liquid fertilizer (10-10-10 or 14-14-14) at half strength every 2-3 weeks during active growth.
Type-dependent. Wax begonias: pinch growing tips to encourage bushier growth and remove spent flower clusters.
Get the Right Soil & Services
Everything your plants need to thrive in Metro Manila.
Nutrient-rich, well-draining potting mix — perfect for ornamental plants. Delivered across Metro Manila.
Shop Garden Soil →Rich, balanced loam soil for landscaping, garden beds, and raised planters. Bulk delivery available.
Shop Loam Soil →Professional landscaping design and drip irrigation installation for homes and businesses in Metro Manila.
View Services →Growing Medium Options
Best soil and medium choices for Begonia.
Light Aroid-Type Mix
BestCoco peat + perlite + orchid bark (2:1:1) in pots with drainage holes provides the perfect combination of moisture retention, drainage, and aeration that begonia roots demand. Add sphagnum moss for rex types. This light, chunky mix prevents the waterlogging that kills begonia roots while holding enough moisture for consistent growth. The standard choice for all begonia types in the Philippines.
Container
ExcellentContainers allow precise control of growing medium, moisture, and positioning — critical for begonia success. Terracotta pots provide beneficial root aeration through porous walls. Plastic pots retain moisture longer (useful for thirsty cane types). For rex begonias, glass terrariums create the high-humidity enclosed environments these foliage specialists thrive in — solving the humidity challenge of air-conditioned Philippine homes.
Terrarium
Excellent for Rex TypesGlass terrariums are the ideal environment for rex and small rhizomatous begonias — providing the 80-100% humidity and stable conditions that produce the most vibrant foliage coloration. Layer: drainage gravel, sphagnum moss barrier, light potting mix. Leave a small opening for air exchange. Water sparingly (every 2-4 weeks). Position in bright indirect light — never direct sun, which overheats the enclosed space. Terrarium rex begonias are self-maintaining miniature ecosystems.
Ornamental Uses
How to use Begonia in your garden and home.
Begonias serve an extraordinarily wide range of ornamental roles — from mass bedding displays to collector terrariums to architectural indoor statements. Few other genera can fill so many different design niches, and the diversity of form, color, and texture within the genus means there is a begonia for virtually every ornamental application in shade or partial shade conditions.
- Rex begonia terrarium collection: Rex begonias displayed in glass terrariums create living art installations — the metallic, jewel-toned leaves are showcased beautifully through glass while the enclosed environment provides the humidity these foliage specialists demand. Multiple terrariums create a stunning indoor collection
- Polka dot begonia statement plant: A mature B. maculata in a decorative pot makes a dramatic interior focal point — the silver-spotted leaves with red undersides are among the most photogenic of all houseplants. Position on plant stands, shelving, or tabletops in bright indirect light
- Angel wing begonia floor specimen: Tall cane begonias reaching 100-150 cm become impressive structural plants for bright indoor corners, flanking furniture, or filling vertical space in room designs. The hanging flower clusters add seasonal color to the architectural form
- Mixed begonia shelf display: Collections of different begonia types on open shelving create a living gallery of foliage textures and patterns — rex varieties provide color and pattern, cane types add height and structure, and wax types contribute flowers
- Wax begonia bedding and borders: Mass plantings of wax begonias in shaded to partially sunny beds create uniform, continuously blooming ground-level displays. Available in coordinated colors (red, pink, white) for formal designs. The toughest begonia for Philippine outdoor conditions
- Shade garden accent: Begonias planted among ferns, aglaonema, and calathea add diversity of form to shade garden compositions. Rex types contribute foliage drama while wax types add flower color in positions too shaded for most other blooming plants
- Container gardens on shaded patios: Mixed begonia containers on covered terraces and shaded balconies create lush, tropical-feeling displays with minimal sun requirements — perfect for the shaded outdoor living spaces common in Filipino homes
Safety & Environmental Benefits
Toxicity info and air quality benefits.
Humans: Begonias contain calcium oxalate crystals, concentrated most heavily in the underground parts (tubers, rhizomes, and roots). Chewing or ingesting these parts causes oral irritation, burning sensation, and swelling. The leaves and stems contain lower concentrations and are less likely to cause significant reaction.
Begonias contribute to indoor air quality through photosynthesis — absorbing carbon dioxide and producing oxygen during daylight hours. While begonias were not specifically included in the NASA Clean Air Study, research from Kamal Meattle and the Central Pollution Control Board (India) has referenced begonias among tropical plants that contribute to indoor air quality improvement when grown in sufficient numbers. The broad foliage of rex and cane begonias provides meaningful leaf surface area for gas exchange relative to their pot size. For Filipino indoor environments, begonias in collections and terrariums contribute to micro-environment quality through transpiration (adding moisture to dry air-conditioned rooms) and oxygen production. The humidity released through transpiration is particularly beneficial in air-conditioned spaces where dry air causes discomfort. Beyond measurable air quality contributions, the psychological impact of surrounding indoor spaces with the spectacular foliage of rex begonias and the sculptural forms of cane types is significant — natural beauty, varied textures, and living color in indoor environments are consistently associated with reduced stress, improved mood, and greater satisfaction with living spaces.
Common Pests & Diseases
Spot issues early and keep your plant healthy.
Powdery mildew
White, powdery fungal coating on leaf surfaces — the most common begonia disease in the Philippines. Thrives in warm, humid conditions with poor air circulation — exactly the conditions that characterize many Filipino indoor growing environments. Prevention: ensure good air circulation around plants, avoid wetting foliage, space plants adequately. Treatment: remove affected leaves, improve ventilation, apply sulfur-based or potassium bicarbonate fungicide spray.
Botrytis (gray mold)
Fuzzy gray mold on flowers, stems, and leaves — develops rapidly on wet plant tissue in humid, stagnant air. Particularly destructive on rex begonia leaves where water sits in the textured surface. Prevention: water at the base only, ensure air movement, remove spent flowers and dead leaves promptly. Treatment: remove all affected tissue, improve air circulation, fungicide spray for persistent problems.
Stem rot (Pythium, Rhizoctonia)
Stems turn soft, brown, and mushy at the soil line — caused by waterlogged growing medium with poor drainage. The #1 cause of begonia death. Prevention: use light, fast-draining potting mix, pots with drainage holes, allow top soil to dry slightly between waterings. Treatment: cut away rotted stem above the infected area, re-root the healthy top section as a cutting, and discard the rotted base and contaminated soil.
Mealybugs
White, cottony clusters at leaf axils, on stems, and on leaf undersides. Suck sap and excrete sticky honeydew. Inspect regularly — mealybugs hide in the crevices of begonia stems and leaf bases where they are easily overlooked. Remove with alcohol-dipped cotton swabs or spray with neem oil. Persistent infestations require systemic insecticide.
Snails and slugs
Common in the moist, shaded conditions begonias prefer (especially outdoor plantings). Chew irregular holes in leaves and can devastate young plants overnight. Handpick at night, use beer traps, apply iron phosphate bait, or surround pots with crushed eggshell barriers. Particularly problematic during the Philippine wet season when populations boom.
Frequently Asked Questions
Quick answers about Begonia.
Are begonias toxic to pets?
Yes — ASPCA lists begonias as toxic to dogs and cats. Contains calcium oxalate crystals, most concentrated in roots/tubers. MILD toxicity — causes oral pain, drooling, vomiting but rarely life-threatening. Pain stops pets from eating large amounts. Place on high surfaces, use terrariums (naturally pet-proof), or choose pet-free rooms.
Why does the Philippines have so many native begonia species?
The Philippines hosts 250+ native Begonia species — a global biodiversity hotspot. Driven by: island geography (7,641 islands create isolated habitats), tropical mountain forests, high rainfall, and geological complexity. Many species exist on single mountains or islands. Filipino botanists discover new species nearly every year. A nationally significant botanical heritage.
What is the difference between wax begonia, rex begonia, and angel wing begonia?
Wax (semperflorens): compact, tough, flowering bedding plant, tolerates some sun. Rex (rex-cultorum): spectacular painted foliage, needs shade + humidity, great for terrariums. Angel wing/cane (including B. maculata): tall plants with spotted leaves and flower clusters, bright indirect light. Each serves a different ornamental purpose.
Why are my begonia leaves dropping?
Common causes: overwatering (#1 — check for wet soil and mushy roots), underwatering (chronic drought), low humidity (especially rex types in AC rooms — below 50%), temperature shock (cold AC drafts), too much direct sun (scorched leaves), or natural aging (older bottom leaves). Check soil moisture and light position first.
Can begonias grow in terrariums?
YES — rex begonias are among the BEST terrarium plants. Terrariums provide 80-100% humidity, stable temperatures, and protection from drafts — perfect for rex types. Layer: drainage gravel, sphagnum barrier, light mix. Leave a small opening for air exchange. Never direct sun (greenhouse oven effect). Water every 2-4 weeks. Produces the most vivid foliage coloration.
How do you propagate rex begonias from leaves?
Leaf wedge: cut leaf into sections containing major veins, lay on moist perlite, plantlets in 4-8 weeks. Whole leaf: cut across veins on underside, pin flat on moist medium, plantlets at each cut. Leaf petiole: insert leaf stem into moist perlite, new plant at base in 4-6 weeks. Philippine warmth and humidity naturally support success.
What is the polka dot begonia and why is it so popular?
Begonia maculata — cane type with silver polka-dotted green leaves and red undersides. Became a global social media sensation due to its photogenic appearance. In PH: 100-800 pesos depending on size. Needs bright indirect light, moderate water, high humidity. Grows tall (60-100 cm) — stake and prune to keep bushy.
How long do begonias live?
Varies by type: wax begonias 2-4 years (replace when leggy), rex begonias 2-5 years (divide rhizomes for continuity), cane/angel wing 5-10+ years (rejuvenate by cutting back old canes). All types propagate easily — leaf cuttings, stem cuttings, or division ensure you never lose a favorite variety.
Sources
References used in this guide.
- Plants of the World Online — Begonia. Royal Botanic Gardens, Kew.
- ASPCA — Animal Poison Control Center: Toxic and Non-Toxic Plant Lists — Begonia.
- Hughes, M. et al. (2015). Begonia sect. Baryandra: Philippine Endemic Begonias. Edinburgh Journal of Botany.
- American Begonia Society — Cultural Information and Classification of Begonia.
- Peng, C.I. et al. (2015). New Species of Begonia from the Philippines. Botanical Studies, 56:30.
This guide is for informational purposes. Begonias are mildly toxic — keep away from pets and small children.
