'Peter III Blue' Aster: Care and Growing Guide

'Peter III Blue' Aster appears in the Proven Winners annual category under Aster. This reference combines the breeder’s dimensions, exposure and seasonal information with a practical placement sketch. It describes the named plant; it does not indicate that Blessed Blooms currently stocks or ships it.

Plant identity and growing facts

Reference: 'Peter III Blue' Aster — Proven Winners, checked 2026-10-31. Dimensions describe an established plant rather than the size of a pot offered for sale.

Does it fit your growing space?

The published exposure is Part Sun to Sun, with a mature height of 18 - 24 Inches and spread of 18 - 24 Inches. Its published height and width are reasonably close; sketch both dimensions when checking its fit among neighboring plants. Check the light at the actual planting spot, including shade cast by taller plants as they grow.

A spacing sketch for 'Peter III Blue'

Using the upper published mature width of 24 inches, 5 plants would occupy approximately 120 inches of a ten-foot run if their mature canopies just met. This is a scale illustration, not a planting prescription. It reserves the full mature width for each plant; paths, access and the breeder’s planting-distance recommendation may require more room. A mixed border needs space for its other plants as well.

Water, winter conditions and maintenance

The breeder’s water category is Consistent. Use it to compare this selection with neighboring plants; it is not a fixed watering interval. Check the root-zone moisture, drainage and weather when deciding whether to water. Its listed hardiness range is 3a–8b. Hardiness is a winter-cold reference, not a guarantee of performance in every soil or summer climate.

“Asters are the reliable performers of fall gardens. They do best when planted in full sun locations in…”

This short opening excerpt is from the breeder’s maintenance notes. Read the complete instructions for this exact selection before using fertilizer or changing a pruning routine.

Using 'Peter III Blue' in a landscape

The breeder describes its habit as mounded. Its green foliage is part of its visual role, while the recorded seasonal interest is early fall; mid fall. Compare the mature outline with the available bed width, sightlines and access around the planting. Repeat a selection for continuity only after checking that the location meets its light and water requirements.

Compare other Aster selections

These named selections have their own growing profiles. Compare their published dimensions and exposure before choosing for the same space; a shared genus does not make their growing requirements interchangeable.

• 'Peter III Blue' Aster: height 18 - 24 Inches; spread 18 - 24 Inches; light Part Sun to Sun.
• Henry™ I Blue Aster: height 15 - 18 Inches; spread 12 - 18 Inches; light Sun.
• Henry™ III Pink Aster: height 18 Inches; spread 24 Inches; light Sun.
• Henry™ III Purple Aster: height 18 Inches; spread 24 Inches; light Sun.

Comparison sources: Henry™ I Blue Aster — Proven Winners; Henry™ III Pink Aster — Proven Winners; Henry™ III Purple Aster — Proven Winners. Dimensions are breeder reference ranges, not comparative trial results.

Flowers and learning from home

For practice designing with cut flowers, explore the Online Hand-Tied Bouquet Workshop and flower-arranging ebook. The Online Courses page explains the options.

For a florist-designed gift, see the current Featured Bouquet and shipping details for eligible continental U.S. destinations. This plant reference does not describe the ingredients in the current bouquet.

Source and scope

Plant facts: 'Peter III Blue' Aster — Proven Winners. Researched 2026-10-31. The placement calculation and design prompts are editorial planning tools. No firsthand growing trial, current stock or guaranteed performance is claimed.