Sunset Hyssop (Orange Hummingbird Mint) care

Light

Most houseplants will scorch where sunset hyssop thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is essential — minimum 6 hours of direct sunlight daily. Produces the most prolific bloom and most compact habit in full sun. Partial shade reduces flowering and increases susceptibility to fungal issues. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 7–10 days once established for sunset hyssop, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water deeply but allow soil to dry between waterings. Young plants need more consistent moisture until roots establish. Drought-tolerant once settled; susceptible to root rot in waterlogged conditions.

Soil and pot

Sunset Hyssop grows best in well-drained sandy or loamy soil, ph 6.0–7.5. Prefers lean to moderately fertile, fast-draining soils. In heavy clay, raise beds or add grit. Rich, moist soils produce lush but short-lived plants with poor flowering. Neutral to slightly alkaline pH is tolerated. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Sunset Hyssop sits happiest at around 25–55% humidity and −5°C to 38°C (23°F to 100°F). Adapted to low to moderate humidity. Good air circulation is critical — in humid climates, space plants generously to prevent powdery mildew and crown rot. If you keep the room above −5°C to 38°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed sunset hyssop sparingly. Light feeding only — one application of a low-nitrogen, phosphorus-rich fertiliser (e.g., 5-10-5) in early spring. Excess nitrogen produces leafy growth and poor bloom. No feeding needed after midsummer. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on sunset hyssop in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Most prevalent in warm, humid summers with poor airflow. Improve spacing, avoid overhead irrigation, and remove affected growth promptly. Plants usually recover after dry weather returns.
• Short-lived in wet, cold winters — Less hardy than A. rugosa; in zones 6–7 with wet winters, plants may not survive without sharp drainage and a dry mulch to protect the crown. Grown as an annual in cooler regions.
• Leaf scorch in reflected heat — Although heat-tolerant, intense reflected heat from light-coloured walls combined with low water availability can scorch leaf margins. Ensure adequate deep watering in such situations.

Propagation

Surface-sow seed at 20–22°C in spring; light is required for germination (10–21 days). Take softwood cuttings in late spring or early summer. Plants self-seed in suitable climates. Cultivars are best propagated by cuttings to maintain flower colour. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Sunset Hyssop is pet-safe. Agastache aurantiaca is in the Lamiaceae family. The ASPCA does not individually list this species, but the genus Agastache and the Lamiaceae family have no recognized toxic principles for dogs or cats. No reports of toxicity in veterinary literature. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Sunset Hyssop deep-dive guides

Every aspect of sunset hyssop care, each with its own calibrated guide:

• Common sunset hyssop problems & fixes
• Sunset Hyssop watering schedule
• Sunset Hyssop light requirements
• Best soil mix for sunset hyssop
• Sunset Hyssop fertilizing guide
• When to repot sunset hyssop
• How to propagate sunset hyssop
• How to prune sunset hyssop
• What's eating my sunset hyssop?
• Sunset Hyssop growth rate & size
• Sunset Hyssop cold hardiness
• Sunset Hyssop temperature & humidity
• Is sunset hyssop toxic to cats & dogs?
• Is sunset hyssop toxic to cats?
• Is sunset hyssop toxic to dogs?
• All 17 Agastache varieties
• Getting sunset hyssop to bloom

Featured in these plant shortlists

Sunset Hyssop qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Sunset Hyssop is also known as Sunset Hyssop, Orange Hummingbird Mint, and Fragrant Hyssop.

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• All 8452 plant care guides in the Growli library