Panicle hydrangea vs Smooth hydrangea

Panicle hydrangea and Smooth hydrangea are often considered for the same spot in the garden (flowers, specimen, container). The data below shows where they differ: size, hardiness, care, toxicity and price.

Panicle hydrangea

Hydrangea paniculata 2 m × 1.6 m after 10 years

The most sun-tolerant and least fussy hydrangea: from midsummer into autumn it carries cone-shaped white or greenish-white panicles that age to pink…

Shrub

Full sun

Part shade

from about PLN 15

Smooth hydrangea

Hydrangea arborescens 1.3 m × 1.5 m after 10 years

A rounded deciduous hydrangea that carries big globe-shaped flower heads from early summer on the current year's shoots, so it blooms reliably even…

Shrub

Part shade

Full sun

Shade

from about PLN 29

Key differences

Panicle hydrangea grows larger: 2 m × 1.6 m after ten years, against 1.3 m × 1.5 m for Smooth hydrangea (an estimate: sources differ).
Smooth hydrangea needs less care than Panicle hydrangea.
Smooth hydrangea also grows in shade, Panicle hydrangea does not.

Which one to choose?

Smooth hydrangea is the better choice if space is tight, you have little time for care or the spot is shady.

Watch out for

Panicle hydrangea

In Central Europe summer heat and drought are its main problem: in hot sun without watering the leaves wilt and scorch and the panicles stay smaller and brown early. After rain and wind the big heavy panicles drag down or snap the shoots of weaker-stemmed cultivars; a hard spring prune and thinning the shoots builds a sturdier frame. Plants grafted on a stem need a permanent stake, as the head breaks out easily under the weight of the flowers. Leaf spot, powdery mildew, aphids and spider mites occur but are rarely serious.

Smooth hydrangea

In Central Europe summer heat and drought are its main enemy: in hot sun without watering the leaves wilt and scorch and the flower heads stay smaller. After rain the big heads of the weaker-stemmed cultivars pull the shoots to the ground, so give them support or cut back only to 30 to 40 cm in spring to build a sturdier framework. Powdery mildew and leaf spot can appear in humid weather and aphids on young shoots, but they are rarely serious.

The data side by side

Feature	Panicle hydrangea	Smooth hydrangea
Group	Shrub	Shrub
Size after 10 years	2 m × 1.6 m (uncertain)	1.3 m × 1.5 m (uncertain)
Ultimate size	0.8–4.5 m × 0.8–3.6 m (uncertain)	0.9–1.8 m × 0.9–1.8 m (uncertain)
Growth rate	Fast	Fast
Light	Full sun, Part shade	Part shade, Full sun, Shade
Soil	Average garden soil, Clay, Sandy, Acidic, Calcareous	Average garden soil, Clay, Sandy, Acidic, Calcareous
Hardiness	down to -34 °C (USDA 4, RHS H7)	down to -34 °C (USDA 4, RHS H7)
Heat tolerance	Medium	Medium
Foliage	Deciduous	Deciduous
Flowering	July–October, white, green, pink, red (uncertain)	June–September, white, pink, green (uncertain)
Water need	Medium	Medium
Drought tolerance	Low	Low
Maintenance	Medium	Low
Planting distance	120 cm	100 cm
For dogs	Toxic	Toxic
For cats	Toxic	Toxic
For children	Mildly toxic	Mildly toxic
Typical price	approx. PLN 19	approx. PLN 32

Prices are rounded, indicative values. Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor. Data updated: October 17, 2026

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