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How to promote Hibiscus growth and combat ants?

Hi folks'

I planted some Hibiscus back in winter and they haven't grown much compared to the other Hibiscus planted in different parts of the garden. About a month ago I noticed some sand appearing and thought I needed to mulch again. Upon further expection it looks like it may be ants. Is it

simple as putting down an ant repellent and if so do you recommend a particular one? Lastly as mentioned above the Hibiscus wasn't growing much before the ants appeared despite seasole/ powerfeed every 2 weeks. Any recommendations on what I could be doing additionally?

Regards,

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Comments

MitchellMc

It sounds like there are a couple of factors at play with your hibiscus @TJP. First, the soil is really important. Hibiscus prefer a rich, well-draining soil that retains some moisture. If you planted them directly into sandy soil, that could explain the slow growth. They may not be getting enough nutrients or moisture, even if you’re feeding with Seasol or PowerFeed. Ideally, when planting, you’d dig a hole and mix in some quality garden soil or a good potting mix with compost to improve fertility and water retention.

As for the ants, the sand you’re seeing is likely from their nests. While ants don’t usually directly harm hibiscus, they can farm aphids or other pests that might stress the plants. Using a granular ant bait spread around the base of the plant usually works well, and if activity is heavy, you might need to repeat it.

Other tips for boosting growth: make sure the plants are getting enough water consistently (sandy soil drains quickly), mulch around them to conserve moisture, and occasionally add compost or a slow-release fertiliser to improve the soil. Once the soil quality is better and ants are managed, you should see the hibiscus start to pick up growth.

Please let me know if you have any questions.

Mitchell

TJP

https://www.workshop.bunnings.com.au/discussion/comment/61351#Comment_61351

Hi Mitchell,

Thankyou for your quick response.

When they were planted I used Bailey's soil improver paired with a granules wetting agent. Fertilised in spring with a instant release fertiliser, but will invest in a long term one now you have recommended.

Regards,

TJP

https://www.workshop.bunnings.com.au/discussion/comment/93148#Comment_93148

The fertiliser I used was richgro all purpose complete garden fertiliser.

MitchellMc

It sounds like your hibiscus are struggling mainly because the sandy soil is not holding enough moisture. Sandy soils drain quickly, so short, frequent waterings often don’t reach the roots deeply enough. A better approach is to give the plants deep waterings every couple of days rather than just a little bit every day. You can test it by watering normally, then checking the top 10 centimetres of soil the next day. If it’s dry, the water isn’t penetrating deeply enough, and the roots aren’t getting enough moisture to grow.

Using a mulch like sugarcane around the plants instead of bark will help retain moisture, and installing a simple drip or soaker system can keep sandy soil consistently hydrated without overwatering. Combined with occasional compost or a slow-release fertiliser, this will give your hibiscus the nutrients and moisture it needs.

Mitchell

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