Why Are My Hosta Leaves Turning Yellow? 9 Causes and Solutions
There are some gorgeous hostas out there with golden leaves – I’m looking at you, ‘Fort Knox’! But yellow leaves aren’t a good thing if the foliage should actually be green.
The good news is that there are lots of ways to fix the issues that can cause the foliage on your hostas to turn yellow. The bad news is that it can be difficult to tell what’s causing the problem in the first place.
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That’s where this guide comes in. We’re going to go over nine of the most common causes and their symptoms to help you figure out what’s turning your hostas yellow, and how to fix it.
Ready? Here’s everything that’s coming up:
9 Reasons Why Hosta Leaves Turn Yellow
Don’t panic, yellow leaves aren’t necessarily a death sentence. Sometimes it just means you need to make some adjustments, or give your plant a little extra care.
1. Bacterial Rot
If the lowest leaves on your plant are turning yellow before becoming mushy and dying, take heed. It might be infected with bacterial soft rot.
Caused by species in the Erwinia genus, this disease causes the petioles to start rotting. If you give them a sniff, they’ll stink like rotting vegetables.
Any time when your hosta is injured by frost, pruning, insects, or accidental damage, it may be prone to infection by the bacteria that cause this disease.
Poorly draining soil, high humidity, and temperatures over 80°F also increase the chances that these disease pathogens will be hanging out in the vicinity.
Sadly, there’s nothing you can do once this disease starts doing its thing. Pull infected plants, and do your best to avoid this
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