Why Are My Leucadendron Leaves Turning Brown Suddenly?

Question

After growing very well in a south facing spot for the past 1.5 years, the lower leaves of my Leucadendron Jester have started turning brown and falling off in the last week. We water twice a week and the soil seems to drain. This is the third Leucadendron in this planter bed along a south facing fence that suddenly started to have its leaves brown and eventually die after growing well for a time. We lost a Safari Sunset earlier this summer (after it had grown for a year) and a Pom Pom (after only a few months). A Sunshine Pincushion next to the Jester is also showing brown leaves at its base, although a Leucadendron Golden Tip nearby seems fine so far. Would really appreciate any suggestions as we love these plants and want to learn how to grow them.

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Answer 1

One thing to note. If a plant dies from a suspected disease, it's best not to replant the same type of plant in that spot. You have better luck not transmitting the disease to a different plant.

It sounds like they are getting too much water, which can lead to root rot. That would explain the sudden browning of the lower leaves. Once established, they only need water during particularly dry periods. And then only once a week is enough. Here is more on their care:

https://www.gardeningknowhow.com/ornamental/flowers/leucadendron/leucadendron-information.htm

https://www.gardeningknowhow.com/plant-problems/environmental/planting-in-old-spaces.htm