About Dahlia
The queen of the flower garden — a tuberous perennial that produces an astonishing range of flower forms, from tiny pompons to dinner-plate-sized blooms in virtually every color except true blue. Dahlias come in ball, cactus, decorative, pompon, waterlily, and single forms, making them endlessly collectible. While they thrive in cooler Philippine highlands like Baguio and Benguet, lowland gardeners can also enjoy them with some extra care during the cooler dry season months. Dahlia belongs to the Asteraceae family and originates from Mexico and Central America; widely cultivated worldwide. In the Philippines, most successful in highland areas..
Dahlias are the star of the Philippine highlands — Baguio's Panagbenga (Flower Festival) celebrates them every February, and the farms of Benguet, Mountain Province, and Bukidnon grow them commercially for Metro Manila flower markets. For Manila-based gardeners, dahlias are a rewarding cool-season project: plant tubers in November and enjoy blooms through February when nights are cooler. Tubers and potted seedlings are available at Baguio market, Quezon Avenue nurseries (during cool season), and online sellers on Shopee and Facebook groups. The dwarf 'Gallery' series is the most forgiving for lowland growing.
Also known as: Dalia.
Popular Varieties
- Dahlia 'Café au Lait' (creamy peach dinner-plate, Instagram famous)
- Dahlia 'Bishop of Llandaff' (scarlet flowers, dark bronze foliage)
- Dahlia 'Kelvin Floodlight' (huge yellow decorative)
- Dahlia pompon types (small, perfectly round ball flowers — heat-tolerant)
- Dahlia 'Gallery' series (dwarf — suitable for containers, more heat-tolerant)
How to Plant Dahlia in the Philippines
Dahlia can be propagated through tuber division, stem cuttings, seeds. The recommended method is tuber division at the start of the cool season.
Propagation Steps
- Step 1: Dig up the clump of tubers after the plant has finished flowering and foliage has yellowed.
- Step 2: Divide the clump so each tuber has at least one attached growing eye (bud).
- Step 3: Let tubers dry in shade for 1-2 days.
- Step 4: Plant tubers 10-15 cm deep in rich, well-draining soil with the eye pointing upward.
- Step 5: Water lightly until sprouts emerge, then increase watering.
- Step 6: For seeds: sow in seed trays and transplant when seedlings have 4-6 true leaves.
Care Guide
Sunlight
Full sun (6-8 hours — morning sun with afternoon shade is ideal in hot Philippine lowlands). Position your dahlia where it receives the right amount of light for healthy growth in Philippine conditions.
Water
Water deeply 2-3 times a week. Keep soil consistently moist but never waterlogged — tubers rot easily in standing water. Adjust frequency during the Philippine rainy season when humidity is higher and soil stays moist longer.
Temperature & Humidity
Ideal temperature range: 15-25°C ideal (this is the main challenge for Philippine lowlands — dahlias prefer cool nights below 25°C). In Metro Manila, grow during the coolest months (November-February).. Moderate — excessive humidity promotes fungal issues. Good air circulation is essential. The warm, humid Philippine climate is well-suited for growing dahlia outdoors or indoors.
Fertilizer
Low-nitrogen, high-phosphorus and potassium fertilizer (5-10-10) every 2-3 weeks during the growing season. Too much nitrogen produces foliage at the expense of flowers.
Pruning
Pinch the main growing tip when the plant reaches 30 cm to encourage bushier growth and more blooms. Deadhead spent flowers promptly. Disbud (remove side buds) for larger individual blooms.
Toxicity & Safety
Non-toxic to humans. Mildly toxic to dogs and cats — can cause mild gastrointestinal upset if ingested in quantity.
Common Problems & Solutions
Poor flowering or small blooms in Manila heat
Cause: Temperatures above 30°C stress dahlias — they prefer cool highlands
Solution: In Metro Manila, treat as a cool-season annual (plant in November, enjoy blooms through February). Provide afternoon shade and mulch to keep roots cool.
Tuber rot
Cause: Overwatering, poor drainage, or heavy monsoon rains
Solution: Plant in raised beds or containers with excellent drainage. In the rainy season, lift tubers and store in a cool, dry place.
Powdery mildew
Cause: High humidity with poor air circulation
Solution: Space plants well. Water at ground level, not overhead. Apply fungicide or neem oil spray at first signs.
Earwigs and slugs eating petals
Cause: Moist conditions around the plant base
Solution: Trap earwigs with rolled newspaper near plants. Use diatomaceous earth or crushed eggshells around the base for slugs.
Frequently Asked Questions
How do you care for Dahlia in the Philippines?
Dahlia needs full sun (6-8 hours — morning sun with afternoon shade is ideal in hot philippine lowlands). Water deeply 2-3 times a week. keep soil consistently moist but never waterlogged — tubers rot easily in standing water.. Feed with low-nitrogen, high-phosphorus and potassium fertilizer (5-10-10) every 2-3 weeks during the growing season. too much nitrogen produces foliage at the expense of flowers.. The Philippine climate with temperatures of 15-25°C ideal (this is the main challenge for Philippine lowlands — dahlias prefer cool nights below 25°C). In Metro Manila, grow during the coolest months (November-February). works well for this plant.
How do you propagate Dahlia?
The recommended method is tuber division at the start of the cool season. Dig up the clump of tubers after the plant has finished flowering and foliage has yellowed. Divide the clump so each tuber has at least one attached growing eye (bud).
Is Dahlia toxic to pets or children?
Non-toxic to humans. Mildly toxic to dogs and cats — can cause mild gastrointestinal upset if ingested in quantity.
Can Dahlia grow in containers in the Philippines?
Yes, Dahlia grows well in containers and is suitable for balcony and indoor gardening in Metro Manila condos and apartments. Use a pot with drainage holes and appropriate potting mix.
What are common problems when growing Dahlia?
Common issues include: Poor flowering or small blooms in Manila heat (caused by temperatures above 30°c stress dahlias — they prefer cool highlands — in metro manila, treat as a cool-season annual (plant in november, enjoy blooms through february). provide afternoon shade and mulch to keep roots cool); Tuber rot (caused by overwatering, poor drainage, or heavy monsoon rains — plant in raised beds or containers with excellent drainage. in the rainy season, lift tubers and store in a cool, dry place); Powdery mildew (caused by high humidity with poor air circulation — space plants well. water at ground level, not overhead. apply fungicide or neem oil spray at first signs).
Growing dahlia in Manila? Tag us @urbangoesgreen on TikTok and show us your garden!