Why Are My Tomato Leaves Curling? - Tui Garden

I also believe that the cause of tomato leaves curling are the big differences between day and night temperatures, especially for tomato plants in pots. Move your rubbish bin off or away from the concrete and put it on earth/dirt/garden surface which should help with the spiky temperature fluctuations. As Gus Aspara says, continue with your usual feeding, watering and spraying regime and just hope that the day and night temperatures improve over summer.

Teia Karauria

• Thanks for the above answers, I have several tomato plants in a row and only two have curling leaves, they are so tightly curled in some cases they look like silvery lines and it is only leaves on the top few branches of the plant affected. One plant is a seedling I bought from a garden center, the other is one I grew from seed. They are side by side but the 6 or so plants on either side of these two are fine. This is a newly established garden with a mix of topsoil, clay and bagged compost. As the other plants are not affected I am not sure that it is temperature related in this case? Any ideas?

  Lisa Ransley

• Hi Lisa, if other plants are in the same mix and haven’t shown any curling leaves we suggest it could be temperature related – based on more sun/heat than the others, or it could also be a varietal issue, some tomatoes are more heat/cold tolerant than others. If outside it could be heat but also cold if temperatures have fluctuated. Use Tui Seaweed Plant Tonic 70ml per 9L watering can and do this every week, they plants should grow out of the distortion. The other thing to check for is insects – are there any aphids on the plants, these sucking insects can cause leaf distortion and also Powdery Mildew – talk to your local garden centre or DIY store for the best solution if you think it is a pest or disease, use the seaweed plant tonic regardless, it will only benefit the plants. All the best ^Tui Team

  Tui Team

Reply