Mold on Soil
White or yellow fuzzy mold on the soil surface is common and usually harmless. It indicates excess moisture and low air circulation.
考えられる原因
Overwatering
Why: Consistently moist soil provides ideal conditions for mold and fungal growth.
Signs to check: Soil surface stays damp, white fuzzy growth on top of soil, musty smell.
Poor Air Circulation
Why: Stagnant air around the soil surface allows mold spores to settle and grow.
Signs to check: Mold appears in sheltered or crowded areas, plant is in a corner or enclosed space.
Organic Matter Decomposition
Why: Decomposing organic material in potting mix (bark, peat) naturally supports fungal growth.
Signs to check: Mold grows on pieces of bark or organic debris on the soil surface.
確認ポイント
- 1Check how often you are watering — is the soil staying too wet?
- 2Assess air circulation in the room and around the plant
- 3Look for any decaying organic material on the soil surface
- 4Determine if the mold is on the soil only or also on the plant
対処法
- Scrape off the visible mold from the soil surface
- Allow the top layer of soil to dry out between waterings
- Improve air circulation with a small fan or by spacing plants
- Replace the top inch of soil with fresh, dry potting mix
- Reduce watering frequency, especially during cooler months
専門家に相談するタイミング
- Mold is also growing on the plant stems or leaves (may be a disease)
- Mushrooms are sprouting from the soil (indicates very wet conditions)
- Plant is showing signs of root rot alongside mold
ポイント
Soil mold is usually harmless and easy to manage. Reduce watering, improve airflow, and it will typically resolve on its own.
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情報源: Missouri Botanical Garden, RHS. 教育目的で公開されている園芸資料をまとめたコンテンツです。情報源の組織は透明性のためにのみ記載されており、推薦を意味するものではありません。