Begonia 'OnTop® Sunglow'
Begonia 'OnTop® Sunglow'
Begonia 'OnTop® Sunglow'
Begonia 'OnTop® Sunglow'

Begonia 'OnTop® Sunglow'
Free Gift

SIZE 3/+

Great for shade

Perfect for pots

Loved by pollinators

Less appealing to
slugs and snails

Hand packed in paper bags

Tender, move indoors
for winter


OnTop® Begonia 'Sunglow' produces double flowers of a fiery golden yellow, with each petal having a ruffled, scarlet-orange edge. It’s simply stunning. Depending on when planted, the first blooms can appear as early as late spring and, with regular feeding, they keep coming until the autumn frosts. The attractive, serrated heart-shaped leaves are dark green throughout the growing season.

⚠️ Please note:  OnTop® begonias grow from relatively small tubers, but these special varieties produce some of the most spectacular blooms. Don't be alarmed if the bulbs appear smaller than you expect from us good things come in small packages!

The OnTop® begonia series features free-flowering plants with a better branching and mounding habit. These are durable plants, early flowering, compact and heat tolerant with an exceptionally long blooming period. Along with others in the OnTop® and AmeriHybrid® strains, Begonia × tuberhybrida 'OnTop® Sunglow' grows best in fertile, moist soil in either partial or full shade. This speciality tuberous begonia performs at its best when grown in a patio container, windowbox or hanging basket. It is easy to grow and care for, and simplicity itself to keep the flowers coming!


Yellow + red edge


25-35 cm / 10-14"

Planting season:


Flowering time:



OnTop® begonias

Botanical name:

Begonia × tuberhybrida 'OnTop® Sunglow'

Light requirements:

Partial shade

Soil moisture:






  • Plant your begonia tubers in spring and grow on in frost-free conditions or plant straight outside after risk of frost has passed
  • Grow in borders or containers in full sun or partial shade
  • Plant the tubers shallowly covered by about 1cm of soil
  • Space the tubers about 10-15cm apart
  • Plant with the concave side facing upwards
  • Water-in after planting and keep hydrated while in growth

    Read more in our planting guide
  • Orders placed before 1 March 2023
    You can expect your order in March 2023
  • Orders placed 1 March - 15 April 2023
    You can expect your order in April 2023
  • Orders placed 16 April - 15 May 2023
    You can expect your order within 10 business days

    See our full shipping & delivery schedule

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Our promises


We supply top size bulbs

Because we represent a Dutch bulb-growing family with a proud heritage that goes back for four generations, we're not about to spoil our top reputation with undersized bulbs. Expect top size bulbs. Always.

We supply top size bulbs


UK's biggest selection

We offer UK's biggest ever selection of amazing flower bulbs online, including lots of unique bulb varieties you won’t get anywhere else. We just love being able to provide you with an incredible choice of top-quality bulbs – it’s what we’re best at.

UK's biggest selection


Grown by the best growers

The best flower bulbs are grown in the Netherlands, where facilities and weather conditions are perfect to ensure premium quality and strong flower bulbs. We cooperate with the best bulb growers to supply world class flower bulbs.

Grown by the best growers


We care about our planet

We help you to reduce waste by using recyclable packaging whenever we are able. Enjoy receiving your bags and boxes of bulbs with a clear conscience and pass the benefits forward by sorting the used packaging materials into your recycling bins.

We care about our planet

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