White geraniums bring a crisp, clean brightness to garden borders and window boxes. The classic white geranium is a versatile plant that offers a cooling contrast to vibrant flower beds and a timeless elegance in container gardens. Its simple beauty makes it a favorite for both beginners and experienced gardeners looking to create a polished, serene outdoor space.
This guide covers everything you need to know to successfully grow and enjoy these luminous plants. We will look at the different types, planting steps, essential care, and creative design ideas.
White Geranium
When you talk about white geraniums, you are usually referring to plants from the Pelargonium genus. True geraniums, or hardy geraniums, are a separate group. For gardens and containers, the pelargoniums are the stars. They are prized for their long blooming season and resilience.
Understanding the main types helps you choose the right plant for your specific needs. Each type has its own growth habit and ideal use.
Common Types Of White Geraniums
There are several primary categories of pelargoniums that feature beautiful white varieties.
Zonal Geraniums (Pelargonium x hortorum)
These are the most common geraniums seen in garden centers. They are named for the horseshoe-shaped “zone” of darker color on their leaves, though this can be less pronounced on white varieties. They grow in an upright, bushy form.
- Popular White Varieties: ‘Americana White’, ‘Horizon White’, ‘Maverick White’
- Best For: Mass plantings in beds, large patio containers, and bold landscape statements.
Ivy Geraniums (Pelargonium peltatum)
Ivy geraniums have trailing stems and glossy, ivy-shaped leaves. They are excellent for spilling over the edges of hanging baskets, window boxes, and wall planters.
- Popular White Varieties: ‘Blizzard White’, ‘Summer Showers White’, ‘White Cascade’
- Best For: Hanging baskets, elevated containers, and adding vertical interest.
Regal Geraniums (Pelargonium domesticum)
Also known as Martha Washington geraniums, Regals have larger, ruffled flowers often with intricate veining or blotches of color. Pure white varieties offer a particularly elegant look.
- Popular White Varieties: ‘Lord Bute’ (dark-centered), ‘White Glory’
- Best For: Container displays in partially shaded spots where their detailed flowers can be appreciated up close.
Scented-Leaf Geraniums
These are grown primarily for their fragrant foliage, which can smell like rose, lemon, mint, or other scents. Their flowers are typically smaller but still charming.
- Popular White-Flowering Scented Varieties: ‘Attar of Roses’ (pale pink/white flowers), ‘Citronella’ (lavender-white flowers).
- Best For: Sensory gardens, herb gardens, and patio containers where leaves can be brushed and enjoyed.
How To Plant White Geraniums
Proper planting sets the stage for healthy growth and abundant blooms. Timing and technique are both important.
Choosing the Right Location
Most white geraniums, especially zonal and ivy types, thrive in full sun. They need at least 6-8 hours of direct sunlight daily for the best flowering. In very hot climates, they benefit from light afternoon shade. Regal geraniums prefer cooler conditions and do well in morning sun and afternoon shade.
Soil Preparation
Geraniums require well-draining soil. They will not tolerate wet, soggy roots. For garden beds, amend heavy clay soil with compost or peat moss to improve drainage. For containers, always use a high-quality, fresh potting mix designed for outdoor flowers. Do not use garden soil in pots, as it compacts and suffocates roots.
Step-by-Step Planting Guide
- Time It Right: Plant after all danger of frost has passed in the spring. Geraniums are sensitive to cold.
- Prepare the Plant: Gently remove the white geranium from its nursery pot. If the roots are tightly wound, gently tease them apart.
- Dig the Hole: In a garden bed, dig a hole slightly larger than the root ball. In a container, ensure there is adequate drainage holes.
- Plant at the Right Depth: Place the plant in the hole so the top of the root ball is level with the surrounding soil. Planting too deep can lead to stem rot.
- Backfill and Water: Fill in around the plant with soil and gently firm it down. Water thoroughly to settle the soil and eliminate air pockets.
- Spacing: Space zonal geraniums about 8-12 inches apart. Ivy geraniums need more room to trail, so space them 12-18 inches apart.
Caring For Your White Geraniums
Consistent care is simple but crucial for keeping your plants vigorous and floriferous throughout the season.
Watering Guidelines
The most common mistake is overwatering. Geraniums prefer to dry out slightly between waterings. Check the soil by sticking your finger about an inch deep. If it feels dry, it’s time to water. Water deeply at the base of the plant, avoiding the leaves, until water runs out of the drainage holes. Then, let the soil dry again. They are somewhat drought-tolerant once established.
Fertilizing For Optimal Blooms
To support continuous flowering, geraniums need regular feeding. Use a balanced, water-soluble fertilizer (like a 20-20-20 formula) every two to four weeks during the growing season. Alternatively, you can use a slow-release granular fertilizer mixed into the soil at planting time, which feeds the plant for several months. Avoid high-nitrogen fertilizers, as they promote leafy growth at the expense of flowers.
Deadheading And Pruning
Deadheading, or removing spent flower clusters, is essential. It prevents the plant from putting energy into seed production and encourages it to produce more blooms. Simply snap or cut the old flower stem off just above a leaf node. To encourage bushier growth, pinch back the tips of young plants in the spring. For leggy plants, don’t be afraid to cut them back by up to one-third to promote new, compact growth.
Overwintering Your Plants
White geraniums are tender perennials. In most climates, they will not survive freezing winter outdoors. You have a few options to save them.
- As Houseplants: Before frost, pot up garden plants and bring them inside to a sunny window. Cut them back by about half. Water sparingly over winter.
- As Dormant Plants: Dig up the plant, shake off soil, and hang it upside down in a cool, dark basement (45-50°F). Or, store them bare-root in paper bags. The stems will shrivel, but in spring, trim them back, pot them up, water, and they should regrow.
- Take Cuttings: In late summer, take 4-6 inch stem cuttings, root them in water or potting mix, and grow the new young plants indoors under lights over winter.
Design Ideas Using White Geraniums
The neutral color of a white geranium makes it an incredibly flexible design tool. It can cool down, brighten up, or elegantly unify a garden space.
Classic Container Combinations
White geraniums serve as the perfect “thriller” or “filler” in container recipes. Try these combinations:
- Monochromatic Elegance: Combine a white zonal geranium with white bacopa, dusty miller (for silver foliage), and variegated ivy.
- Patriotric Display: Pair red and white zonal geraniums with blue lobelia or fan flower (Scaevola).
- Moon Garden: Use white geraniums with other white flowers like nicotiana and sweet alyssum, and silver foliage plants for a garden that glows at dusk.
Garden Border Applications
In landscape beds, white geraniums create definition and light.
- Use them as a crisp edging plant along a walkway.
- Plant them in drifts among darker foliage plants like coleus or purple fountain grass for dramatic contrast.
- Let white ivy geraniums spill over a retaining wall or the edge of a raised bed for a soft, cascading effect.
Special Theme Gardens
White geraniums fit seamlessly into specific garden styles.
- Cottage Gardens: Their cheerful blooms mix well with roses, lavender, and delphiniums for a relaxed, romantic feel.
- Formal Gardens: The clean lines and uniform color of white zonal geraniums make them ideal for symmetrical plantings in parterres or near entryways.
- Wedding or Event Decor: Potted white geraniums can be used to line aisles or decorate patios for a fresh, garden-party atmosphere.
Common Problems and Solutions
Even tough plants can encounter issues. Here’s how to identify and fix common problems with white geraniums.
Pests To Watch For
- Geranium Budworms: These caterpillars bore into flower buds, causing them to fail and turn black. Handpick them or use a biological control like Bt (Bacillus thuringiensis).
- Aphids: Small green or black insects that cluster on new growth. A strong spray of water from a hose or insecticidal soap usually controls them.
- Whiteflies: Tiny white insects that flutter up when the plant is disturbed. Use yellow sticky traps and insecticidal soap.
Regular inspection is the best defense. Catching pests early makes control much easier.
Disease Prevention
Good cultural practices prevent most diseases.
- Edema: This is not a disease but a physiological condition caused by irregular watering. It appears as corky, scabby spots on leaves. Prevent it by watering consistently and ensuring good air circulation.
- Botrytis Blight (Gray Mold): Appears as gray, fuzzy mold on flowers or leaves in cool, damp conditions. Remove affected parts immediately, improve air flow, and avoid overhead watering.
- Root and Stem Rot: Caused by overwatering and poor drainage. The plant wilts, and stems may turn black at the base. Ensure your soil drains well and let it dry between waterings.
Yellowing Leaves
Yellow leaves can have several causes. Lower leaves naturally yellow and drop as the plant grows. Widespread yellowing often signals overwatering. Yellowing between the veins on new growth can indicate an iron deficiency, common in plants grown in high-pH soil. Applying a chelated iron supplement can correct this.
Propagating White Geraniums
Creating new plants from your existing white geraniums is easy and cost-effective. Stem cuttings is the most reliable method.
- In late summer, choose a healthy, non-flowering stem that is 4-6 inches long.
- Using a clean knife or shears, cut just below a leaf node.
- Remove the leaves from the lower half of the cutting.
- Dip the cut end in rooting hormone powder (this step is optional but increases success).
- Insert the cutting into a small pot filled with a moist, soilless potting mix or perlite.
- Place the pot in a bright, warm spot out of direct sun and keep the medium lightly moist.
- Roots should form in 3-6 weeks. Tug gently on the cutting; if you feel resistance, it has rooted. You can then pot it up into regular soil.
Frequently Asked Questions
Are White Geraniums Perennials?
White geraniums (Pelargoniums) are tender perennials. They are perennial in frost-free climates (USDA zones 10-11). In most areas, they are treated as annuals or brought indoors for the winter.
How Often Should I Water My Potted White Geranium?
Water your potted white geranium when the top inch of soil feels dry to the touch. This may be every 2-4 days in hot summer weather, and less frequently in cooler or cloudy conditions. Always ensure the pot has drainage holes.
Why Is My White Geranium Not Flowering?
Lack of flowers is usually due to insufficient sunlight, over-fertilizing with nitrogen, or not deadheading. Ensure your plant gets at least 6 hours of direct sun, switch to a balanced or bloom-booster fertilizer, and regularly remove spent flower heads.
Can White Geraniums Grow In Shade?
White geraniums will not bloom well in full shade. They require full sun to partial shade. For areas with afternoon shade, they will still produce flowers but may become leggy and bloom less profusely than plants in full sun. Regal geraniums tolerate more shade than other types.
What Plants Pair Well With White Geraniums?
White geraniums pair beautifully with almost any color. Excellent companions include blue ageratum, purple petunias, red salvia, silver dusty miller, and trailing sweet potato vine. Their neutral color helps balance and highlight other plants in the arrangement.