At a glance
- Light
- Medium / indirect light
- Typical interval
- Every 3 to 5 days (summer)
Every 6 to 10 days (winter) - Climate
- 18–24 °C
- Humidity
- 50–70 %
- Pet safety
- Toxic to cats and dogs
- Scientific name
- Hydrangea macrophylla
When and how much water
Water hortensia when the top 2 cm of soil feel dry. In summer that’s typically every 3 to 5 days. In winter, slow down to every 6 to 10 days. Use room-temperature water and let any excess drain. Never leave the pot sitting in standing water.
Adjust the timing for the light at the plant, the pot’s size and material, and the humidity indoors. Terracotta dries faster than glazed ceramic.
Light and placement
Hortensia thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Feeding
Feed hortensia every 21 days while it’s actively growing. Use a fertilizer for acid-loving plants at half the strength on the label, and only on soil that’s already damp.
When growth pauses, skip the fertilizer and let it rest.
Temperature & humidity
Hortensia is comfortable between 18 and 24 °C. It handles a cool room well, even in winter, as long as it stays above 5 °C.
It does best at 50–70% humidity. It doesn’t need misting.
Common problems
Yellowing, drooping, and dry edges often point to watering or drainage. Compare the signs before changing the routine.
Find what’s wrong
Toxic to pets?
Yes. Keep it out of reach.
Pet-safety information in the JungleBook uses ASPCA reference data where available. It is reference information, not veterinary advice.
Full Hortensia toxicity guide →
Pet-safe alternatives with similar light
Common questions
How often should I water a Hortensia?
Water your hortensia (Hydrangea macrophylla) when the top 2 cm of soil feel dry. In summer, that’s typically every 3 to 5 days. In winter, slow down to every 6 to 10 days.
How much light does a Hortensia need?
Hortensia thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Is Hortensia safe for cats and dogs?
The plant contains hydrangin (cyanogenic glycoside). Chewing it can cause oral irritation, drooling, and vomiting. Keep hortensia out of reach of pets, or pick a non-toxic alternative like baby rubber plant, scarlet star bromeliad, Fuchsia, or spider plant.
Why are my Hortensia’s leaves turning yellow or drooping?
On a hortensia, yellowing and soft growth usually mean overwatering: watch for yellowing leaves, limp drooping leaves, or root rot. Let the soil dry further between waterings and check drainage. If you see dramatic wilting, crispy leaf edges, or browning flower heads instead, it’s likely thirsty. Water a little more often. With Botanicaly Pro, Botanicaly Bot can help assess visible signs from a photo and suggest possible causes.
Sources5 references
- Royal Botanic Gardens, Kew: Plants of the World OnlineTaxonomy · accepted name · classification
- North Carolina State University Extension Gardener Plant ToolboxDappled or partial shade · afternoon-sun protection · drainage · moisture · size · pests and diseases
- Iowa State University Extension and OutreachBright indirect light · 60–65°F · evenly moist soil · surface dry-down · decorative-pot drainage · post-flowering limits
- Royal Horticultural SocietyLight · moisture · H. macrophylla pruning context · ericaceous and peat-free container compost · container cultivars
- ASPCA Animal Poison ControlHydrangea arborescens pet-safety record · not species-exact for Hydrangea macrophylla
Last reviewed: 2026-09-21
