How to treat Magnolia Little Gem with rotting buds?

Jacques

I bought this little gem magnolia from Bunnings recently with a flowering bud on.  I have put it in a larger pot. The plant looks healthy. We have experienced lots of rain for months, each time, I have moved it under the pergola so that it doesn’t get drenched. I made a little probe with a wool knitting needle and a small wood handle to check the soil if it has too much or no water. I have used liquid fertiliser power feed only, but now the one and only bud is rotting. I don’t know if it has something to do with the over cloudy and little direct sun (light) we have experienced during this winter months.

JacobZ

Hi @Jacques,

Welcome to the Bunnings Workshop community, it is fantastic to have you with us.

During winter, it is quite common for Little Gem magnolias to struggle with buds, especially when kept in pots. The combination of short daylight hours, reduced direct sunlight, and consistently cool, damp weather slows the plant’s growth. In this semi-dormant state, the magnolia is conserving energy and is less likely to push a bud to full bloom. Instead, the bud may sit for weeks without progress, and under prolonged dampness, it can easily succumb to rot. 

Because Little Gem magnolias naturally flower in the warmer months—from late spring through summer and into early autumn—winter buds are often unreliable. The plant’s energy is not geared toward flowering at this time of year, and so even a healthy-looking bud can collapse before opening. This is not a sign that the plant is unhealthy overall, but rather a reflection of seasonal limitations.

In winter, the most important care you can provide is protection from excessive rainfall and waterlogging, while still ensuring good airflow. Moving the pot under cover, as you’ve done, is exactly the right approach. 

It is also best to reduce fertiliser applications during these months, as the plant is not actively growing. Instead, focus on keeping it in the brightest, sheltered position available and allow it to rest. Once spring arrives with more warmth and sunlight, the magnolia will return to active growth and begin setting new buds that are much more likely to open successfully.

So, while the rotting bud is disappointing, it is a common occurrence in winter and not a long-term concern. Your Little Gem will respond positively as conditions improve, producing stronger, more reliable flowers when its natural blooming season begins.

You might like to have a read through Growing, Pruning & Caring for Magnolias for some further guidance.

Let me know if you have any further questions.

Jacob