I think he said it was a sack not a patch - I don't see why you couldn't use it as a mulch around your ornamentals later in the year and then let the frost do it's work. Just a thought.
For starters, it depends what sort of blight it was. "Blight" has become a generic term for all sorts of fungal problems. The most common fungal problem, though, is Early Blight.
Early Blight infections arrive through the air. The spores are invisible to the naked eye and everywhere. They can land on the soil or drop from the foliage to the soil and will live on. But they don't poison the soil in any way.
The only way they can re-impact on a plant is for them somehow to be brought back in contact with the plant's foliage. Turn over the surface soil, burying any spores that might remain on the surface, and they're out of harm's way.
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I think he said it was a sack not a patch - I don't see why you couldn't use it as a mulch around your ornamentals later in the year and then let the frost do it's work. Just a thought.
For starters, it depends what sort of blight it was. "Blight" has become a generic term for all sorts of fungal problems. The most common fungal problem, though, is Early Blight.
Early Blight infections arrive through the air. The spores are invisible to the naked eye and everywhere. They can land on the soil or drop from the foliage to the soil and will live on. But they don't poison the soil in any way.
The only way they can re-impact on a plant is for them somehow to be brought back in contact with the plant's foliage. Turn over the surface soil, burying any spores that might remain on the surface, and they're out of harm's way.