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Pelargonium x hortorum
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- Planting Geraniums: Pot Size, Compost, Spacing and the First Fortnight
- Geranium Care: Watering, Feeding and Reading Yellow Lower Leaves
- Why Geraniums Stop Flowering, and How to Get Them Blooming Again
- The Geranium Year: Overwintering Dry and Bringing Plants Back
- Geranium Problems: Blackleg, Botrytis, Rust and the Pests to Expect
- Geranium Cuttings: How to Root Them and Why They Are So Easy
Common problems
Start from what you can see on the plant.
Pests and diseases (19)
Problems recorded for this plant, most serious first.
Bacterial Wilt
Disease
Leaves wilt while still green during the day and recover in the morning and evening; after a few days of this the plant dies. Cut the stem and stand it in water and a milky white bacterial ooze streams out in threads.
Brown Leaf Spot
Disease
Small light brown to gray-brown spots form on the leaves and enlarge into irregular lesions. When they merge the whole leaf dies and plant vigor drops sharply.
Black Rot
Disease
V-shaped yellowing spreads inward from the leaf margins and the veins darken into a black network. As it advances the whole plant wilts and dies.
Rust
Disease
Small raised orange-yellow to red-brown pustules form on both leaf surfaces, then rupture and release powdery spores. Heavy infection yellows the leaves and kills them early.
Anthracnose
Disease
Light brown to dark brown round lesions with sharp margins form on leaves and fruit, slightly sunken in the center. In wet weather salmon-pink slimy spore masses ooze out on the lesions.
Root-knot Nematode
Pest
The plant wilts in the daytime and does not recover with feeding or watering. Pull it up and the roots carry beaded chains of galls of varying size with few fine roots.
Gray Mold
Disease
Water-soaked brown lesions form on flowers, fruit and leaves, densely covered by a fuzzy gray mold. Fruit rots and drops, and decay continues in storage after harvest.
Leaf Spot
Disease
Small round brown to gray-white lesions appear on the lower leaves, the centers turning gray with tiny black specks. As they multiply the leaf yellows and drops early.
Bacterial Speck
Disease
Small dark brown spots ringed by a yellow halo form on the leaves, and heavy infection burns off the whole leaf. Fruit carries scattered black pinpoint specks.
