'Serendipity' Ornamental Onion (Allium hybrid)
You can only choose one Ship Week per order for all plants in order to check out.
How Does Proven Winners® Measure Plant Sizes?
We list our plants by container size, which reflects the amount of soil and root growth each plant has when it ships. Actual plant height and width vary by variety and season, and many plants grow quickly as the weather warms.
To help you understand what to expect, refer to our size guide below. You can also find each plant’s approximate arrival size and mature size on its product page.
How Does Proven Winners® Measure Plant Sizes?
How Does Proven Winners® Measure Plant Sizes?
Plant Height By Container Size
This chart highlights the typical heights for each size category while also showing how container sizes compare, giving you a clear, straightforward way to understand plant size at arrival and choose the best fit for your gardening needs.
This chart shows typical plant heights and compares container sizes, helping you quickly understand arrival size and choose the best fit.
Soil Volume By Container Size
This chart shows the typical soil volume for each container size, listed in both imperial and metrics units for easy comparison.
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'Serendipity' Ornamental Onion (Allium) boasts globe-like, rosy-purple flowers mid to late summer that top attractive blue foliage. The upright habit works as a thriller in containers and the landscape. Alliums are charming plants for the rock or herb garden. When the foliage is bruised, it smells like onions since they are in the onion family. Butterflies and honeybees adore the flowers' sweet nectar but deer and rabbits steer clear of this perennial beauty.
- 15-20 inches tall and 10-15 inches wide at maturity
- Hardy in zones 4-8, be sure to check your USDA zone to ensure success
- Plant in part to full sun (4+ hours daily)
- Space plants 10-15 inches apart for best results
- Produces rosy, purple globe-like flowers throughout summer
- Maintains upright blue-green foliage spring to frost
- Great for borders, containers, cut flowers, mass plantings
- Attracts bees and butterflies, Resists deer and rabbits
- Heat tolerant, drought tolerant, fragrant flowers, fragrant foliage, fall interest
Care: Trim stems after it has finished flowering if desired. Fertilize with Proven Winners Continuous Release Plant Food in spring.
Shipping Info:
- Enjoy free shipping on orders over $175
- Size at shipping varies by season, plant, and trimming schedules
- Quart perennials are 5-8 in. at the time of shipment
- 0.65 Gallon perennials are 6-14 in. at the time of shipment
- 1 Gallon perennials are 6-24 in. at the time of shipment
- Perennials shipped Nov-Apr will arrive dormant; perennials shipped Apr-Oct will arrive green or in bloom
Please Note: 'Serendipity' Ornamental Onion Allium is restricted and cannot be shipped to the state(s) of ID, NV and WA.
