Flower Bloom Calendar: When Flowers Bloom Through the Year
This calendar compares published flowering periods for eight flower groups. Every row names the plant, location, and type of growing conditions covered by its source. The months are a guide, not a guarantee, because climate, weather, and cultivar can change when a plant flowers.
The calendar is a reference for observed or published windows. It does not promise that every plant in a genus blooms in the same month, and it does not imply native range, availability, or a gardening schedule.
Key takeaways
- In the UK garden records used here, peonies flower mainly in late spring to early summer, while lilies and sunflowers flower in summer.
- Repeat-flowering roses can extend from summer into autumn; once-flowering roses do not follow the same schedule.
- Common daisy has a long British Isles flowering season, with occasional flowers outside the main spring-to-autumn period.
- Bird of paradise can flower in winter and spring under protected UK cultivation, which is not an outdoor calendar for every region.
- Read flowering times with their location and plant type: weather, elevation, cultivar, and growing conditions can shift the season.
Which Flowers Bloom in Each Part of the Year?
The grid contains eight flowering records. A filled circle means the source includes that month in its stated flowering period. The text beside each plant shows the location and growing conditions. A filled circle does not guarantee that every specimen will flower during that month.
Source window includes the month. Blank cells are outside the declared source window. Split windows remain split in the row.
| Plant guide | Source and growing context | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bellis perennis Common daisy | March to October; British Isles observation Last checked 2026-09-05. | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Taraxacum section Taraxacum Common dandelion group | April to June and September to November; Kew Gardens, London Last checked 2026-09-05. | ● | ● | ● | ● | ● | ● | ||||||
| Chamaemelum nobile Roman chamomile | Spring to autumn, shown as April to October; UK garden context Last checked 2026-09-05. | ● | ● | ● | ● | ● | ● | ● | |||||
| Rosa species Rose | Early summer to autumn, shown as June to October; repeat-flowering roses, UK Last checked 2026-09-05. | ● | ● | ● | ● | ● | |||||||
| Paeonia species Peony | Late spring to early summer, shown as May to June; UK garden context Last checked 2026-09-05. | ● | ● | ||||||||||
| Lilium species True lily | Summer, shown as June to August; UK garden context Last checked 2026-09-05. | ● | ● | ● | |||||||||
| Helianthus annuus Common sunflower | Summer, shown as June to August; UK horticultural context Last checked 2026-09-05. | ● | ● | ● | |||||||||
| Strelitzia reginae Bird of paradise | Winter to spring, shown as December to April; tender UK indoor or protected setting Last checked 2026-09-05. | ● | ● | ● | ● | ● |
The grid uses records for common daisy, dandelion, Roman chamomile, rose, peony, true lily, common sunflower, and bird of paradise. The date below each range shows when its source was last checked.
How Do Region and Climate Change Bloom Time?
Region changes flowering time because temperature, day length, moisture, and elevation differ. One source records common daisies from mid-March to mid-October in the British Isles, while the RHS gives the broader description “late spring and summer” for UK gardens. The dandelion row is more local: Kew records the strongest flowering at its London garden from April to June and again from September to November, although dandelions can flower at other times in suitable conditions.
Cultivar and growth form add another layer. RHS guidance separates roses that flower once in summer from repeat-flowering roses that continue into autumn. Lily groups are primarily summer flowering in the RHS garden context, but species and hybrid groups differ. Peonies are described as a short late-spring to early-summer display in the UK, while Strelitzia reginae may flower in winter and spring when a protected plant has enough warmth, light, and maturity. A month bar therefore records a source window, not a biological deadline.
Each row keeps the source location visible. A UK flowering period should not be applied automatically to the tropics, the Southern Hemisphere, or a wild population. Where a source says “spring to autumn,” the grid displays April through October as an approximate UK month range and keeps the original seasonal wording in the row. Weather, elevation, mowing, watering, cultivar, and cultivation can all shift flowering time.
Which Flowers Are Included in the Calendar?
The calendar includes flower groups for which the source gives both a flowering period and a location:
- Common daisy: Bellis perennis, British Isles spring to autumn record.
- Dandelion: Taraxacum section Taraxacum, London garden split window.
- Roman chamomile: Chamaemelum nobile, UK spring to autumn source wording.
- Rose: Rosa species, repeat-flowering UK pattern; once-flowering roses differ.
- Peony: Paeonia species, UK late-spring to early-summer context.
- True lily: Lilium species, UK summer garden context.
- Common sunflower: Helianthus annuus, UK summer horticultural context.
- Bird of paradise: Strelitzia reginae, protected UK winter to spring context.
Aster and hydrangea are omitted because the available sources cover groups broader or narrower than the identification pages. Their absence does not mean that these plants have no flowering season.
Why Do Aster and Hydrangea Need a More Specific Calendar Record?
The RHS aster guide combines Aster, Callistephus, Eurybia, Kalimeris, and Symphyotrichum and describes them flowering from summer to the end of autumn in UK gardens. This site's aster guide covers only Aster and Symphyotrichum. Copying the broader RHS range into one bar would make it appear that the same dates were documented for only those two genera.
The RHS hydrangea guide describes shrubby hydrangeas flowering from mid to late summer in UK gardens. The genus also contains plants with other growth habits, including climbers. The current hydrangea guide covers the whole genus, so the narrower shrub range is not shown as a rule for every Hydrangea.
A calendar bar needs a source that names the same species or clearly defined group, states the location, and identifies the growing conditions. Without that match, a precise-looking month range could mislead the reader.
Why Does a Seasonal Flower List Need a Location?
The question “what flowers are in season?” needs a location. Spring in the British Isles occurs at a different time of year from spring in the Southern Hemisphere, while tropical plants may flower on a different schedule. Use the calendar grid with its location column, and do not infer local availability or native status from a filled cell.
How Do You Check the Bloom Window for an Identified Flower?
Start with the scientific name, then find a flowering record that states both a period and a location. Note whether it describes a wild population, a garden plant, a protected indoor plant, a cultivar group, or a repeat-flowering form. If the source gives only a season, treat any conversion to months as approximate.
Compare the range with the plant in front of you. The month can support an identification, but it cannot overrule conflicting leaves, flower structure, stems, or growth habit. Use the species directory to inspect the plant's identifying features, or use the Flower Identifier when its identity is still uncertain.