Trialling Banksia ‘Sentinel’

This is a favourite coastal hedging plant of mine which I have been including in my planting designs for the past 7 years or so….sorry, I’m finding it difficult to keep track of time 😉

I say it is on trial or has been on trial for a while as it does have a couple of things it dislikes and doesn’t work everywhere. Firstly, it absolutely hates being over watered, especially if the weather is warm, it doesn’t need extra moisture. It is part Banksia integrifolia which as a straight species tree can often turn up its toes if its feet get wet.

Secondly, it gets taller than the label specifies, almost double the size to be frank. This is not that unusual all plant tags need to be read with some scepticism, I don’t know why?

In the image above you can see a specimen which is around 4 metres tall and around 1 to 1.5 metres wide, making Banksia ‘Sentinel’ a wonderful tall screening plant. It can handle a front line coastal position like in this featured garden in Coledale, it also will take light frost and extended periods of drought.

It is a very useful plant to use in a native garden to add texture and colour. The undersides of the leaves are a bright silver and the new growth bronze and then light green. The upright branches prune well and contrast beautifully with more weeping foliaged plants.

I like to combine Banksia ‘Sentinel’ with lime greens or brighter silvers like in the images above with Acacia ‘Mini Cog’ and Eremophila Nivea Grafted.

It also looks lovely with the mounding habit and larger leaves of Hymenosporum ‘Luscious’ as seen above.

For me I would say the trial period is over, this useful Banksia has excelled in the many gardens in which I have specified it. I am about to plant a hedge of it in my own garden in a tight position with limited sun and if I ignore it enough I’m sure it will fulfil its role as a dense screen in a wind tunnel near the sea 👍🏼

Two more things to note, Banksia ‘Sentinel’ is not a particularly floriferous native, it should be grown for its foliage and it needs excellent drainage!

4 thoughts on “Trialling Banksia ‘Sentinel’

  1. Rhiannon on

    Thank you for a fantastic blog, I am a first time gardener and am learning so much from it and your designs.

    I have been looking for the good part of a year for a good dense native screening plant that grows 3-4m tall – so I think Sentinel it is!

    I am looking to plant them behind an east facing fence on a busy road so would like them to grow quite fast. What kind of growth rate does the Sentinel have? (I haven’t been able to find guidance on this on the web). The other option I was looking into was Hakea salicifolia as I understand they are fast growing – have you had experience with them at all?

  2. Stephen on

    I planted a row of banksia sentinel down the fence line on the shady southern side of the house in December 2019. Tricky site as it gets full sun in summer and no sun down low in winter. After seeing a banksia sentinel featured in the Mallee designs Bulli garden (and some free advice from Kath on the comments, thanks), I thought Sentinels might fit the bill. They tripled in size from 30cm to a metre in the first growing season. The upright multi branched habit will be perfect for screening our windows when they grow a bit more. I don’t have excellent drainage and they still seem to be happy even with no sun in winter (I have never needed to water them). I’m really happy with this miniature coast banksia. The hardest thing is finding a nursery who stocks them. Thanks.

    • Kath Gadd on

      Hi Stephan,

      Thanks so much for sharing your experience with Banksia ‘Sentinel’ your position sounds exactly the same as where I just planted my hedge. Hopefully they will grow as quickly as yours,

      Best Wishes,

      Kath

  3. Cathryn Williams on

    Hi
    I’ve just bought a banksia sentinel and plan to plant it near a wall as a screen. We do have water pipes running Along the fence nearby and wondering what the root system is like and whether it’s ok to plant near pipes?
    Many thanks!

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