Page 1 of 1

Issue with Banksia Oblongifolia

PostPosted: Thu Sep 25, 2014 8:47 pm
by LAdd
Banksia2.jpg
Hi all. I live in the Ipswich area of SEQ. I`m noticing that since somewhere mid winter, the buds on my banksia oblongifolia have turned black. Coming into spring most of my other plants are starting to move again, but this one has only a couple of new shoots near the bottom. The rest of the plant doesn't seem to be doing anything. I`m not sure of the PH of my soil at present. We are on a clay soil which I had worked a bit before planting. It was thriving before winter as are most of the other plants. I did feed it some chelated iron a few times over the months. I`m not sure if it is lacking in something of if this might just be a case of frost damage. If it looks to be frost damage, then what action is needed? Thankyou in advance :)

Leon.

Re: Issue with Banksia Oblongifolia

PostPosted: Tue Sep 30, 2014 2:26 pm
by HortMaster
May be frost damage. I'd also look into whether it has a calcium deficiency. Check your pH also and determine whether that needs adjusting. Just from looking at the photo my advice would be to chuck on some dolomite lime:) or gypsum

Re: Issue with Banksia Oblongifolia

PostPosted: Tue Sep 30, 2014 3:55 pm
by LAdd
Hi Hortmaster. Thanks for the reply :) I bought a PH test kit last weekend. I will give that a shot this weekend coming. As for the gypsum....I did mix gypsum into the soil about a year and a half back. Maybe it wasn`t enough though. Just referring to the photo again.....that tiny piece of new growth at the tip has not done much for sometime now....although over the course of the week, the blackened bud underneath that growth, looks as if its going to open and produce multiple shoots. I`m not sure if maybe I should prune that top growth back or just wait and see what happens. What do you think?

Re: Issue with Banksia Oblongifolia

PostPosted: Wed Oct 01, 2014 11:41 am
by HortMaster
I'd probably just leave it and see what happens:)

Re: Issue with Banksia Oblongifolia

PostPosted: Wed Oct 01, 2014 3:44 pm
by LAdd
Thanks for your feedback....much appreciated :)

Re: Issue with Banksia Oblongifolia

PostPosted: Fri Oct 03, 2014 10:33 am
by LAdd
Just following up on the PH levels. I`ve taken numerous samples and seem to get a reading of 7 to 8. I`ve read conflicting views on the addition of sulphur and it`s effectiveness in lowering the ph of soils. I`m just wondering if this may be part of my issue? :?

Re: Issue with Banksia Oblongifolia

PostPosted: Sat Jun 10, 2017 11:02 am
by steveatmaleny
See the leaves with the yellow edges and green stripe up the centre? My Banksia Oblongifolia plants have that. The yellow eventually takes over and the leaves turn brown and die. Does anyone know what causes it?

Re: Issue with Banksia Oblongifolia

PostPosted: Sat Jun 10, 2017 11:04 am
by steveatmaleny
See the leaves with the yellow edges and green stripe up the centre? My Banksia Oblongifolia plants have that. The yellow eventually takes over and the leaves turn brown and die. Does anyone know what causes it? It is not frost damage.