🌺 Begonia Sunlight Calculator
Find out exactly how much sun your begonias need based on type, location, and climate conditions
| Begonia Type | Min Sun (hrs) | Ideal Sun (hrs) | Sun Tolerance | Spacing |
|---|---|---|---|---|
| Wax / Fibrous | 3 | 4–6 | Highest | 8–12 in |
| Tuberous | 2 | 2–4 | Low | 8–12 in |
| Rex | 1 | 2–3 | Very Low | 12–18 in |
| Angel Wing / Cane | 2 | 3–5 | Low | 12–18 in |
| Rieger / Elatior | 3 | 4–6 | Moderate | 10–14 in |
| Rhizomatous | 2 | 2–4 | Low | 10–14 in |
| Hardy / Grandis | 2 | 3–5 | Moderate | 12–18 in |
| Light Level | Description | Best Begonia Types | Window Direction |
|---|---|---|---|
| Bright Indirect | Near window, no direct rays | Wax, Angel Wing, Rieger | East or filtered South |
| Medium Indirect | A few feet from a window | Tuberous, Rhizomatous, Hardy | North or shaded East |
| Low Light | Interior room, minimal light | Rex | North-facing |
| Direct Sun | Unfiltered window light | Wax only (morning) | East only, avoid South/West |
| Placement | Sun Exposure | Best Types | Notes |
|---|---|---|---|
| Under tree canopy | 1–3 hrs filtered | Rex, Tuberous, Rhizomatous | Dappled shade is ideal for sensitive types |
| North side of house | 2–4 hrs indirect | All types except Wax | Consistent indirect light without heat stress |
| East-facing bed | 3–5 hrs morning sun | Wax, Angel Wing, Hardy | Morning sun is gentle and safe for most begonias |
| Partial sun border | 4–6 hrs mixed | Wax, Rieger | Only for sun-tolerant types with afternoon shade |
| Begonia Type | Bloom Season | Bloom Style | Indoor/Outdoor |
|---|---|---|---|
| Wax / Fibrous | Spring through frost | Clusters of small flowers | Both |
| Tuberous | Summer–early fall | Large showy double blooms | Both (shade) |
| Rex | Grown for foliage | Small, inconspicuous | Indoor preferred |
| Angel Wing / Cane | Spring–fall | Drooping flower clusters | Both |
| Rieger / Elatior | Fall–winter | Rose-like double blooms | Indoor preferred |
| Rhizomatous | Late winter–spring | Sprays of small flowers | Both |
| Hardy / Grandis | Summer–fall | Pendulous pink clusters | Outdoor (USDA 6–9) |
begonia need sun however the kind and amount of this depends much on the variety of begonia. Getting the right light is important, because it helps the plant do its work and grow steadily. A good start is to give a begonia at least three to four hours of bright but filtered sun daily.
Like this the plant forms thick green leaves. Usually four to six hours of light together with a bit wet ground matches the main needs of begonia.
How Much Sun Do Begonias Need
Filtered or spread light works well for indoor begonia. It protects against burns on the leaves. Place begonia behind a thin curtain or beside soft light to avoid problems.
Too little light can push begonia to grow long and thin and less flowery. Bright, steady, indirect sun works best, especially for royal and root species. The “Beefsteak” begonia are especially forgiving about that.
The colour of leaves shows about light needs. Bronze leaf begonia do well in full sun. Green leaf begonia like shade.
So bronze leaf types handle strong summer sun without big troubles.
Tuberous begonia are a bit more demanding. They want bright light, but no direct sun. They do well in full or half shade, although heavy shade with little light can stop flowering.
Early morning or late afternoon sun through east or west window works best. A southeast-facing window or midday sun one should avoid. From around 11 until the 6th in the evening tuberous and Elatior begonia truly need shade.
Wax begonia are especially flexible. They grow just as well in full sun as in shade. That makes them among the most useful begonia around.
They flower from spring until cold with bright leaves and colorful flowers.
Five types of begonia truly do well in full sun: Surefire, Dragon Wing, San Francisco, Summerwings Tuberous and Double Delight Tuberous. Surefire begonia work outside because of their bright flowers and low care needs. Dragon Wing begonia are among the best for full sun, even so one never leave them dry outside, because that can burn them.
Give them a bit of filtered shade in the late afternoons helps.
Cane begonia like bright indirect light. Something like a southeast-facing window works, or south-facing with the plant a few feet away. Morning sun from sunrise until around 10 or 11, then filtered shade for the rest of day, is another good way.
Many begonia handle more sun, if they stay wet but not too soaked. Place them under thin tree cover is a nice way too provide them soft filtered light outside. When growing outside, choose a safe place and protect begonia against warm afternoonsun makes a big difference.