How to treat Star Jasmine leaves yellowing?

[silencer2008]

  

Hi guys, just an after some advice. 
Star Jasmine plants have yellowing leaves. Have them across the fence, some worse than others. 
Is this due to nutrient deficiency? 
currently have drip lines that water twice a week. They get about 6 hours sun, more during summer. 

[EricL]

Hello @silencer2008 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your star jasmine.

Yellowing leaves on your star jasmine can definitely be a sign of a nutrient deficiency, but a few other factors could be at play too. Since some plants are worse than others, it’s possible that your soil conditions vary a bit along the fence line.

If the yellow leaves are older ones (lower on the plant), it could be a nitrogen deficiency. A good liquid feed like PowerFeed 2.4L Fertiliser Concentrate or Thrive All Purpose should help green them up. If the yellowing is more between the veins while the veins stay green, that’s usually an iron or magnesium deficiency, which can be fixed with Epsom salts (magnesium sulphate).

Your watering schedule sounds reasonable, but if the soil isn’t holding moisture well, the roots might be struggling to take up nutrients. Try checking the soil—if it dries out too much between waterings, adding some organic mulch or compost can help. On the flip side, if it's staying soggy, you might need to improve drainage.

Sunlight-wise, six hours is great, though if they get a lot more in summer, they could be feeling a bit stressed from the transition. A bit of extra water during hot spells can help prevent that.

I also suggest having a look at this guide - How to diagnose a sick plant by @Noelle.

If you need further assistance, please let us know.

Eric