The spider plant — Chlorophytum comosum — has been a fixture of British homes since the 1970s, and its longevity as a popular houseplant is entirely deserved. It is fast-growing, adaptable to a wide range of light conditions, produces cascading offshoots (the ‘spiderettes’ that give it its name) that are simple to propagate, and is generally very easy to keep. It is also, however, the plant most commonly brought to plant clinics with brown-tipped leaves — and the cause is almost always the same thing: UK tap water.
The Brown Tips Problem
Brown leaf tips are by far the most common spider plant complaint in the UK, and they are largely a water chemistry issue.
Spider plants are sensitive to fluoride and, to a lesser extent, chlorine and dissolved salts from hard tap water.1 Fluoride is added to mains water in many UK regions and is present at lower levels throughout the UK water network. As you water your plant week after week, fluoride is carried through the vascular system to the leaf tips — the furthest point from the roots — where it accumulates to toxic concentrations and kills the leaf tissue, producing the characteristic brown, dry tip that spreads gradually inward over time.
The fix: Switch to one of the following:
- Collected rainwater — the best option and free; soft, naturally fluoride-free
- Filtered water — a jug filter removes chlorine and reduces mineral content meaningfully
- Tap water left to stand overnight — allows chlorine to off-gas, though does not remove fluoride; a partial improvement
Brown tips can also result from allowing the plant to dry out severely and repeatedly (the leaf tips are the first tissue to die from water stress), or from very low humidity in a centrally heated room. But in UK homes, water chemistry is the primary cause.
Once brown tips have formed, they don’t reverse. Trim them back with clean scissors, angling the cut to follow the natural leaf taper, then address the water source to prevent new tips browning.
Light
Spider plants tolerate a wide range of light conditions. They grow well in bright indirect light and maintain healthy foliage in medium light — a north-facing room is manageable, though growth is slower. They tolerate some direct sun, particularly morning light through an east-facing window, but harsh direct afternoon sun bleaches and scorches the leaves.
The variegated forms — the common green-and-white striped variety — require somewhat more light than solid green forms to maintain their variegation. In low light, the white stripes fade toward pale green as the plant produces more chlorophyll. Moving to a brighter spot restores the variegation on new growth.
UK winter: Spider plants slow down significantly between October and March but maintain themselves in most UK indoor conditions. Moving them closer to a window through the winter months helps sustain some active growth and keeps the variegation strong.
Watering
Spider plants prefer consistently moist soil during the growing season, though they tolerate occasional drying out far better than ferns or peace lilies. Water when the top inch of soil is dry — typically every seven to ten days in summer. In winter, reduce to every two to three weeks, checking the soil rather than following a fixed schedule.
Spider plants have fleshy, carrot-like roots that store some water, giving them more drought resilience than plants with fine fibrous roots. If you miss a watering, the plant droops and looks unhappy but recovers quickly once watered.
Overwatering signs: Yellowing leaves, soft stems, root rot at the base. Less common in spider plants than in aroids, but poor drainage combined with frequent watering will cause it. Always use a pot with drainage holes and empty the saucer after watering.
Spiderettes and Propagation
Mature spider plants produce long, arching runners from the centre of the plant, each bearing one or more small plantlets — the spiderettes. These are the plant’s natural propagation method and one of its most appealing characteristics.
To propagate: allow the spiderette to develop small root nubs (visible as little white bumps at its base) before separating it from the runner. You can either:
- Pin the spiderette into a small pot of compost while still attached to the mother plant, allowing roots to establish before cutting the runner
- Cut the runner and place the spiderette in water, changing the water weekly until roots are one to two centimetres long, then pot into compost
Spring and early summer are the best times to propagate. Spiderettes taken in UK autumn and winter root more slowly in the cooler temperatures of most British homes.
Humidity and Temperature
Spider plants are genuinely tolerant of normal UK household air. Unlike calatheas or peace lilies, they don’t require supplemental humidity and cope well with the dry air of central heating. Brown tips in spider plants are usually a water chemistry issue rather than a humidity one.
Keep above 7°C — spider plants are hardier than most tropical houseplants but are damaged by frost. They are commonly grown in conservatories and porches in the UK, which is fine through spring, summer, and autumn, but bring them in before temperatures drop in October.
Feeding
Feed every two to four weeks in spring and summer with a balanced liquid fertiliser. Do not feed in winter when growth has slowed. Over-feeding causes salt buildup in the soil, which contributes to leaf tip browning — if you suspect this, flush the pot thoroughly with filtered or rainwater.
Common Problems
Brown leaf tips: Almost always UK tap water fluoride accumulation or mineral salt buildup. Switch to rainwater or filtered water, trim existing brown tips, and flush the pot with clean water.
Yellow leaves: Overwatering or waterlogged soil. Check drainage and reduce watering frequency.
Pale or faded variegation: Insufficient light. Move to a brighter position.
No spiderettes: The plant needs to be mature (usually at least two years old) and slightly pot-bound before it produces runners reliably. A young plant in a very large pot will focus on root development before flowering and producing offsets.
Limp or drooping leaves: Underwatering — water thoroughly and the plant typically recovers within a few hours.
Footnotes
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Royal Horticultural Society (2024). ‘Chlorophytum comosum (spider plant)’. Available at rhs.org.uk/plants/chlorophytum/comosum/details. The RHS notes fluoride and salt sensitivity in Chlorophytum comosum and recommends soft water or rainwater to prevent the leaf tip browning common in UK hard water areas. ↩
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