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What’s in Bloom? June at RBG

May 29, 2023

What Blooms in June?

Note: this is a general guide of what typically blooms this month at RBG. Bloom periods may vary by up to 2 weeks. For the best view of what’s blooming right now at RBG, see the current photos on RBG’s Instagram, or find the “Bloom Watch” section on the What’s in Bloom page.

A rainbow of blooms spreads across the gardens! 

June begins with a bang as the Iris and Peony collections burst into bloom at Laking Garden, the competing sweet fragrances of the two collections is truly mesmerizing. Early June brings the last of the Lilacs, with the Preston and Japanese tree Lilacs flowering in the Arboretum, alongside Kousa Dogwood, Beautybush, Mock-orange, Cinquefoil and Weigela.

In Rock Garden, discover showy perennials like Fleeceflower, Globe Daisy and Cranesbill. The first of the roses start to appear in Hendrie Park, alongside companion plants like Butterflyweed and Ornamental Onions. 

  • Purple And White Iris In Bloom
  • Large Pink Peony With Open Centre
  • Syringa komarowii subsp. reflexa lilac blooms
  • monarch butterfly on butterfly weed

Pictured, left to right: Iris, Peony, Lilac, Butterflyweed

Later in the month, Rock Garden comes into its own with displays of flourishing perennials, including Ornamental Onions, Sages, Coralbells, and Cranesbills. The Weigelas, Stewartias, and Japanese Snowbells bloom in the canopy understory and lush conifers are showing off a wide variety of developing cones.

The Rose Garden bursts into bloom with the first full flush of the year, showcasing disease-resistant, cold-hardy and drought-tolerant Roses, including several Canadian introductions which can be found at local growers. Mid-June in Laking Garden brings the Clematis collection, and beautiful heritage perennials.

  • Rock Garden Purple Allium Blooms
  • Cornus Dogwood Arboretum
  • Huchera Coral Bells
  • Deep pink roses in the foreground with purple globe shaped allium in the background

Pictured, left to right: Ornamental Onions, Dogwood, Coralbells, Roses

June closes with more beautiful perennials across the gardens, including Lavender, Smooth and Oakleaf Hydrangea, Yarrow, Astilbe, Hibiscus, and the first of the Coneflowers. With different textures of ornamental grasses, trees, shrubs and the sounds of the water features, the gardens are a treat to all your senses.

  • Pink Hydrangea Starting To Bloom
  • Tight, spiky groupings of small dense flowers. Chinese Astilbe
  • bright pink hibiscus
  • Large grouping of English Lavender plants

Pictured, left to right: Hydrangea, Astilbe, Hibiscus, Lavender

June Favourites

Lilac Tree In Foreground Overlooking People Walking Along A Path In Distance


The last of the Katie Osborne Lilac Collection bloom into early June. 

Major collection located in the Arboretum. Lilac specimens also found in Hendrie Park, Laking Garden and Rock Garden.

Bed Of Multi Coloured Iris


Bearded and Siberian Iris blooms from early to mid-June.

Main collection found in Laking Garden, with plants also found at Rock Garden and Laking Garden.

Laking Garden Rows Of Peonies In Bloom


The herbaceous peony collection blooms from early to mid-June. 

Major collection in Laking Garden, with plants also found at Rock Garden and in Hendrie Park.

Rose Garden Collection


The rose collection features multiple flushes mid June through fall, alongside companion plants that bloom throughout the season. 

The Rose Garden is located in Hendrie Park.

Plants that typically flower in June at RBG

  • Astilbe
  • Beautybush
  • Butterflyweed
  • California Poppy
  • Canada Anemone
  • Cinquefoil
  • Clematis
  • Coneflower
  • Coralbells
  • Cranesbill
  • Dogwood
  • False Indigo
  • Fleeceflower
  • Globe Daisy
  • Horse Chestnut
  • Hosta
  • Hydrangea
  • Iris
  • Japanese Snowbell
  • Lavendar
  • Lily
  • Lindheimer’s Beeblossom
  • Lotus*
  • Milkweed
  • Mock Orange
  • Ornamental Onion (Allium)
  • Peony*
  • Rose
  • Salvia
  • Sunflower family
  • Tulip Tree
  • Waterlily
  • Weigelia
  • Wild Thyme
  • Yarrow

Bloom times vary. Check our social media feeds for what’s in bloom currently! 

Blooms by Season

Plants of interest are ever-changing in RBG’s five cultivated garden areas and nature sanctuaries. Learn what’s blooming now or see the blooms calendar for a rough estimation of what to expect each season.