Summer sounds like the perfect time to nurture a bonsai. More light. More warmth. More growth.

But for beginners, bonsai summer is also the season most trees quietly give up. Leaves crisp. Soil turns to concrete. Roots cook in tiny pots. If you’re Googling “my bonsai is dying” in July, you’re not alone, and it’s probably one of these mistakes.

Here’s exactly what’s going wrong, and how to fix it.

How Often Should I Water My Bonsai In Summer?

In the summer, you need to water your bonsai more often than you think. Bonsai pots are small. They dry out fast in heat.

Check the soil daily in summer, not weekly. Push your finger about 1cm into the soil. If it’s dry, water thoroughly until it drains from the bottom.

Common watering mistakes include:

  • Watering on a fixed schedule instead of checking the soil
  • Wetting only the surface (roots stay dry)
  • Using a heavy jet that disturbs the soil and roots 

Our Bonsai Watering Care Guide covers exactly how to water correctly. Worth bookmarking.

Can My Bonsai Get Too Much Sun In Summer?

Absolutely, your bonsai can get too much sun in the summer. This surprises most beginners. 

  • Indoor bonsai sitting on a south-facing windowsill in July can overheat. The glass intensifies heat. Roots bake. Leaves scorch.
  • Outdoor bonsai need bright light, but not brutal midday sun. A little afternoon shade goes a long way in a heatwave.

The fix? Move indoor trees slightly back from glass during peak afternoon hours. For outdoor trees, dappled shade between noon and 3pm keeps them happy.

Should I Feed My Bonsai In Summer?

Yes, summer is actually prime feeding season for your bonsai. This is where a lot of beginners fall short. They water diligently but forget that a bonsai in a small pot has limited nutrient reserves. Summer growth is hungry work. 

Feed every two weeks through summer with a balanced bonsai fertiliser or liquid feed. Prefer something lower maintenance? Slow release feed works brilliantly for busy beginners.

Why Are My Bonsai Leaves Dropping In Summer?

Your bonsai leaves are dropping in the summer? A few likely culprits:

  • Underwatering: the most common cause by far
  • Overwatering: yes, both extremes cause leaf drop
  • Draughts or air conditioning: indoor trees hate being blasted with cold air
  • Root issues: compacted or wrong soil stops roots absorbing water properly

If you’re wondering “my bonsai is dying”, start with watering. Then check the soil. Our Bonsai Care Hub has guides on diagnosing common problems.

Do I Need To Prune My Bonsai In Summer?

You do need to prune your bonsai in summer. Light pruning, yes. Heavy structural work, no. Summer is about maintaining shape. Snipping new shoots that are disrupting the silhouette. Think of it as a tidy-up, not a renovation.

Save hard pruning for late winter or early spring. Visit our Bonsai Pruning Guide for a full walkthrough.

What’s The Best Bonsai For Beginners To Start With?

If you’re just starting out and want a tree that’s genuinely forgiving through summer, a Chinese Elm is the classic recommendation. It tolerates a bit of inconsistency and gives clear signals when something’s wrong.

Browse our Bonsai Trees for Beginners, all selected with new growers in mind. If you’re looking for the full picture on how to care for a bonsai tree for beginners, our Care Hub is the place to start.

Still Not Sure What’s Wrong With Your Bonsai?

We’ve been helping beginners get this right since 2004. If your tree is struggling this summer and you can’t figure out why, just ask.

Or explore our full range of bonsai trees, tools, soil and food. Everything you need to keep your tree thriving, whatever the season.