Geranium (Pelargonium) Care Guide: Growing Vibrant Blooms Indoors and Out

Walk into any garden centre in spring and you will find the benches packed with what the labels call “geraniums” — cheerful, bushy plants loaded with red, pink, white, or salmon blooms that promise colour from May right through to the first autumn frost. These popular patio and bedding plants are in fact Pelargonium, a genus native to South Africa, and they are among the easiest flowering plants any gardener can grow. Whether you want to fill a window box, brighten a patio pot, or bring a bold splash of colour indoors, Pelargonium delivers.

Part of their appeal is sheer versatility. There is a Pelargonium for almost every situation: upright bushy types for summer beds, trailing varieties that spill from hanging baskets, stately Regal types with flowers to rival orchids, and scented-leaf cultivars that perfume the air with rose, lemon, or mint as you brush past. They flower from the moment they go out in late spring right through to the first hard frost — a span of five or six months of continuous colour that few other plants can match.

One thing worth clearing up before we go further: true hardy Geraniums — sometimes called Cranesbills — are an entirely different plant. Cranesbills (genus Geranium) are fully hardy perennials that die back in winter and regrow from the roots each spring. Pelargonium is tender, killed by frost, and grown as an annual in most cool climates or overwintered indoors. The mix-up dates back to the 18th century, when both genera were classified together; the names have been tangled ever since. Throughout this guide, when we say “geranium” we mean Pelargonium — the popular garden and houseplant — unless we specify otherwise.

Timing varies by region — pennisetum alopecuroides fountain grass has the month-by-month schedule.

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Quick Reference

Types of Pelargonium

Not all geraniums are alike. The Pelargonium genus contains hundreds of species and thousands of cultivars, but for gardeners the market breaks down into four main groups, each suited to slightly different uses.

Zonal Geraniums

Zonal geraniums (Pelargonium × hortorum) are the classic garden geranium — upright, bushy plants that produce tight, ball-like flower heads in shades of red, orange, pink, salmon, white, and bi-colour. Their common name comes from the dark horseshoe-shaped zone that marks most varieties’ leaves. They are the most widely grown type, thriving in beds, borders, containers, and hanging baskets. Expect heights of 12–18 in (30–45 cm) and continuous blooms from late spring until frost.

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Ivy-Leaf Geraniums

Ivy-leaf geraniums (Pelargonium peltatum) trail rather than mound, making them the go-to choice for window boxes, hanging baskets, and wall planters. Their thick, glossy, ivy-shaped leaves are more heat- and drought-tolerant than those of zonal types. Flowers are slightly looser in form — often with a delicate, almost star-shaped appearance — and come in the same wide colour palette. Individual stems can trail 2–3 ft (60–90 cm) or more by midsummer.

Regal / Martha Washington Geraniums

Regal geraniums (Pelargonium × domesticum), sold in North America as Martha Washington geraniums, produce the most dramatic flowers of the group: large, open blooms with ruffled petals often marked with darker veining or blotching. They prefer slightly cooler conditions than zonal types and tend to stop flowering in the heat of midsummer before reblooming in autumn. They are excellent as patio container plants in mild coastal climates or as houseplants kept near a bright, cool window.

Scented Geraniums

Scented geraniums are grown primarily for their aromatic foliage rather than their flowers, which are small and modest by comparison to other groups. The leaves can mimic an extraordinary range of scents — rose, lemon, peppermint, nutmeg, and even chocolate, depending on the cultivar. Popular in herb gardens, as edging plants, or indoors on a sunny windowsill, scented geraniums are also useful in the kitchen: rose-scented leaves (P. graveolens) can be used to flavour cakes and jellies. Plants are often more upright and airy in habit than zonal types.

How to Grow Geraniums

Pelargoniums are not fussy plants, but they do have a few strong preferences. Meet those and you will be rewarded with non-stop colour for the entire growing season.

Outdoor Growing: Beds and Borders

In the ground, geraniums need a spot with at least 4–6 hours of direct sunlight per day — more is generally better, though afternoon shade helps in very hot climates. Plant into fertile, well-drained soil after all risk of frost has passed. Space plants 12 in (30 cm) apart to allow airflow, which reduces the risk of grey mould (botrytis). Work a slow-release granular fertiliser into the planting hole and water in well. Once established, they are reasonably drought-tolerant, though they bloom best with consistent moisture.

Outdoor Growing: Containers and Pots

Containers are where geraniums truly shine. Use a peat-free multipurpose compost mixed with 20–30% perlite for drainage. Choose a pot with drainage holes — waterlogged compost is the fastest way to kill a geranium. Terra-cotta pots are ideal because they allow the compost to dry slightly between waterings, mimicking the plant’s preferred dry cycle. Position containers in a sunny spot and water when the top inch of compost is dry. Repot into a slightly larger container each spring if the plant has been overwintered.

Overwatering is the most common killer — allium gladiator ornamental onion explains how to get it right.

Pinching for Bushy Growth

To encourage branching and a fuller, more floriferous plant, pinch out the growing tips when plants are young — remove the top 1–2 cm of each stem just above a leaf node. Do this 2–3 times during the first month after planting. The temporary loss of early flowers is more than compensated for by a much bushier plant that produces far more blooms later in the season. This technique is especially useful for zonal geraniums grown in beds, where a dense, mounding habit looks best.

Watering & Feeding

Overwatering is the number-one mistake gardeners make with geraniums. These plants evolved in semi-arid conditions in South Africa and actually prefer a cycle of dry-then-wet rather than constantly moist soil. Let the top inch or two of compost or soil dry out before watering. In pots, this typically means watering every 3–5 days in warm weather and weekly or less in cool conditions. Always water at the base, not over the foliage, to reduce the risk of fungal disease.

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For feeding, a high-potassium fertiliser encourages flowering. A liquid tomato feed — the same product used on fruiting vegetable crops — applied every 2 weeks during the growing season works exceptionally well and is widely available. Alternatively, a general balanced liquid feed can be used, though results may be slightly less floriferous. Avoid high-nitrogen feeds, which push leafy growth at the expense of flowers. Start feeding in spring once plants are in active growth, and continue until early autumn. Stop feeding over winter if you are overwintering plants in a cool, resting state.

Getting the timing right is half the battle — see quercus robur (english oak): growing.

Plants in containers need more frequent feeding than those in the ground because watering leaches nutrients out of the compost over time. A visual sign that feeding is overdue is pale, slightly washed-out leaves combined with a drop in flower production. Respond with a dose of liquid tomato feed at half the recommended strength, increasing to full strength once you see the plant respond.

If you prefer a more cost-effective option, homemade fertilisers can be surprisingly effective on geraniums. Our guide The Gardener’s Secret Weapon for More Flowers (and It’s in Your Kitchen!) walks through several kitchen-based feeding solutions that are free to make and genuinely boost bloom production.

Indoor Geranium Care

Geraniums make excellent houseplants when given the right conditions. Indoors, they need a bright, sunny window — south- or west-facing is ideal in the northern hemisphere. Aim for at least 4 hours of direct sun per day; without adequate light, plants become leggy, pale, and reluctant to flower. The ideal indoor temperature range is 65–75°F (18–24°C). They tolerate slightly cooler conditions but will struggle if temperatures drop below 50°F (10°C).

The most common reason indoor geraniums fail is overwatering. Allow the compost to dry appreciably between waterings — this is even more important indoors where there is no rain, wind, or sun to help dry the pot naturally. Water thoroughly, allow excess to drain away, and never leave the pot sitting in a saucer of water.

Overwintering Geraniums

In climates colder than USDA zone 10, geraniums must be brought indoors before the first frost. The classic approach is to lift container plants (or dig up bedding plants), cut them back by about half, remove all dead or yellowing leaves, and pot them up into fresh, well-draining compost. Place in a cool, frost-free spot — a cool conservatory, porch, or windowsill works well — and water sparingly through winter, just enough to stop the compost from drying out completely. Resume normal watering and feeding in early spring when new growth appears.

Alternatively, geraniums can be overwintered bare-root: lift the plants, shake off the soil, and hang them upside-down in a cool, frost-free garage or shed. In spring, cut back dead growth, pot up into fresh compost, water, and bring into warmth and light. This works surprisingly well and takes up almost no space.

Why Geranium Leaves Turn Yellow

Yellow leaves on a geranium are one of the most common problems gardeners encounter, and they can have several different causes. Identifying which one is affecting your plant is the key to fixing it quickly.

1. Overwatering — the most common cause. Soggy compost starves roots of oxygen, leading to widespread yellowing across the plant. Let the compost dry out and improve drainage.
2. Underwatering — prolonged drought causes leaves to yellow and crisp at the edges. Water more consistently, especially in hot weather.
3. Nutrient deficiency — nitrogen deficiency in particular causes pale, yellowing leaves, often starting with older foliage. Resume regular feeding with a balanced or high-potassium liquid feed.
4. Cold temperatures — exposure to temperatures below 50°F (10°C) causes yellowing and leaf drop. Move plants to a warmer spot and protect from draughts.
5. Root rot — a consequence of chronic overwatering, root rot causes rapid yellowing and collapse. Remove the plant from its pot, cut away any brown, mushy roots, treat with a fungicide, and repot into fresh, dry compost.
6. Natural ageing — the lowest leaves on a geranium naturally yellow and die as the plant ages and channels energy upward. A few yellow leaves at the base is completely normal; simply remove them to keep the plant tidy and to improve airflow.

Deadheading & Pruning

Deadheading — removing spent flower heads before they set seed — is the single most effective thing you can do to keep a geranium blooming continuously. As soon as a flower head begins to fade, snap or snip the entire stem back to the nearest leaf node or leaf. If you leave old flower heads in place, the plant diverts energy into seed production and flowering slows dramatically. Make deadheading part of your routine every few days during the growing season.

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Beyond deadheading, pinching out the growing tips of young plants (as described in the growing section) encourages a bushy, compact habit. Throughout the season, remove any dead, damaged, or diseased leaves promptly to maintain good airflow and reduce the risk of fungal problems.

In autumn, if you plan to overwinter plants, cut them back by about one-third to a half before bringing them inside. This reduces water demand during the dormant period and encourages fresh, vigorous growth in spring. In late spring when new growth resumes, you can cut back more heavily to any healthy growing node if the plant has become very woody.

For planting dates in your area, check allium mount everest ornamental onion.

For a step-by-step guide to all three pruning methods—deadheading, the summer trim, and the hard cut-back that stops leggy growth—see how to prune geranium plants.

Common Problems

Geraniums are generally tough and trouble-free, but a handful of issues do crop up regularly. Most problems stem from conditions that are too wet, too dark, or too crowded — address those underlying causes and you will prevent the majority of issues before they start.

• Botrytis (grey mould) — a fuzzy grey mould that appears on stems, leaves, and flowers in humid conditions or where plants are crowded. It is most common on overwintered plants kept in a cool, still environment. Remove affected material immediately, improve airflow, and avoid wetting the foliage. A copper-based fungicide can help in severe cases.
• Geranium rust — rust-coloured pustules on the undersides of leaves, with corresponding yellow or pale spots on the upper surface. It spreads rapidly in wet weather and can defoliate a plant quickly if left unchecked. Remove and bin (do not compost) affected leaves, improve airflow, and apply a fungicide registered for rust. Avoid overhead watering at all times.
• Aphids — clusters of small green, black, or grey insects on soft new growth and flower buds, often accompanied by sticky honeydew residue on leaves below. Knock off with a strong jet of water or apply an insecticidal soap. Beneficial insects such as ladybirds and lacewings will deal with minor infestations naturally if you avoid broad-spectrum pesticides.
• Whitefly — small white flying insects that rise in clouds when plants are disturbed. A persistent pest in greenhouses and on indoor plants. Yellow sticky traps help monitor populations; insecticidal soap or neem oil applied in the evening (when pollinators are less active) are effective treatments. Repeat applications every 5–7 days may be needed to break the life cycle.
• Edema (oedema) — corky, blister-like bumps on the undersides of leaves, caused not by a pest or pathogen but by the plant absorbing water faster than it can transpire it. Common in cool, humid weather or when plants are overwatered. Not harmful in itself, but affected leaves will not recover. Improve drainage, increase light, and let the compost dry more between waterings.
• Leggy growth — if a geranium is not getting enough light it will stretch toward the available source, producing long, weak stems with widely spaced leaves and few flowers. Move the plant to a brighter position and cut back the leggy stems to encourage fresh, compact growth from lower nodes.
• 7 Hardy Geranium Varieties That Bloom for Months Without Deadheading (Zone 3–9 Guide)

Propagating Geraniums

Growing new geraniums from cuttings is simple, free, and produces flowering-sized plants within a single season. You can multiply a single favourite plant almost indefinitely this way — a great strategy if you have a colour or variety you want to preserve year after year without spending money on new plants each spring. The best time to take cuttings is late summer (August–September in the northern hemisphere), using healthy, non-flowering stems from the current season’s growth. Late summer cuttings root quickly in the warmth, have all winter to develop into sturdy young plants, and are ready to bloom freely from their very first outdoor season.

For planting dates in your area, check veronicastrum virginicum ‘album’ (culver’s root).

Step-by-Step Stem Cuttings

1. Select a healthy shoot 3–4 in (8–10 cm) long with at least two or three leaf nodes.
2. Cut cleanly with a sharp, clean blade just below a node.
3. Remove the lower leaves, leaving two or three at the top. Remove any flowers or flower buds.
4. Allow the cut end to callous for an hour or two in a warm, dry spot — this reduces the risk of rotting.
5. Insert the cutting into a small pot of peat-free cutting compost or a 50:50 mix of multipurpose compost and perlite.
6. Water lightly and place in a warm, bright spot out of direct sun. A propagator lid or clear plastic bag can help retain humidity, but remove it once roots form (usually 3–4 weeks).
7. Roots form quickly — within 3–4 weeks at 65–70°F (18–21°C). Once rooted, pot on into fresh compost and grow on in a warm, bright spot through winter for a head start the following spring.

Cuttings can also be rooted in a small glass of water, though success rates are slightly lower than in compost, and the transition to soil can cause a brief check in growth. For overwintering purposes, the compost method is recommended.

Related Guides

Dive deeper into specific aspects of Pelargonium care with our dedicated spoke articles:

• The Gardener’s Secret Weapon for More Flowers (and It’s in Your Kitchen!) — homemade fertiliser recipes that boost geranium blooming without spending a penny.
• Indoor Geranium Cultivation: A Comprehensive Guide — everything you need to grow and overwinter geraniums successfully indoors.
• Why do geranium leaves turn yellow and how to save pelargonium? — full diagnosis and treatment guide for yellowing leaves.
• 10 Best Companion Plants for Geraniums — proven picks for pest control, summer color, and container combinations, with the Japanese beetle science explained.

Sources

• University of Minnesota Extension. Geraniums for the home and garden. University of Minnesota. https://extension.umn.edu/flowers/geraniums-home-and-garden
• Clemson Cooperative Extension. Geranium. Clemson University. https://hgic.clemson.edu/factsheet/geranium/
• How to Propagate Geraniums From Cuttings Step by Step
• Zone 4 Geraniums
• Zone 5 Geraniums: Tender Types Go Out After Last Frost, Hardy Cranesbills Stay All Winter
• Zone 10 Geraniums: Heat-Tolerant Varieties and Year-Round Care That Actually Works
• Zone 9 Geraniums: A Two-Season Growing Guide for Spring and Fall Blooms
• Zone 8 Geraniums: Plant in March, Pick Ivy-Leaf for Summer Heat, Keep Blooming to November
• Zone 7 Geraniums: Plant After Last Frost, Pick Winter-Hardy Types, and Bloom for 6 Months
• Geraniums in Zone 6: The May Planting Window, Which Varieties Overwinter, and How to Keep Them for Years
• How to Grow Geraniums in Zone 3