How often should indoor houseplants be watered in winter?

Most tropical houseplants reduce their transpiration and growth rate significantly during late autumn and winter due to lower light levels. The general rule is to reduce watering frequency by 40-50% compared to spring and summer. Always perform the 2-inch finger moisture test: insert your finger 2 inches into the compost and only water if the substrate feels completely dry.

When and how should I prune Wisteria in the UK?

Wisteria requires a two-stage pruning regimen to flower prolifically: (1) Summer Prune in July or August: cut back the whippy green current-season shoots to five or six leaves (approx. 15-20cm); (2) Winter Prune in January or February: cut back those same shoots further to two or three dormant buds (approx. 5-8cm) while the plant is fully dormant.

Why do houseplant leaves turn yellow with brown crispy tips?

Brown crispy tips paired with yellow margins are usually caused by a combination of low ambient humidity (common in centrally heated rooms) and uneven watering, or tap water mineral accumulation (chlorine and fluoride). Increasing humidity with pebble trays and allowing compost to dry slightly between thorough soakings will resolve the issue.

What are the three RHS pruning groups for Clematis?

Clematis are divided into three RHS pruning groups: Group 1 (early spring flowering like Clematis montana) requires minimal pruning immediately after flowering in late spring. Group 2 (large-flowered cultivars blooming in May-June and again in late summer) requires light shaping in late February. Group 3 (late-flowering like Clematis viticella) requires hard cutting back to strong pairs of buds about 30cm (1ft) above ground level in February.

Which popular indoor houseplants are safe for cats and dogs?

Pet-safe indoor houseplants include Calathea (Prayer Plants), Boston Ferns (Nephrolepis exaltata), Spider Plants (Chlorophytum comosum), Peperomia varieties, Parlor Palms (Chamaedorea elegans), and Phalaenopsis Orchids. Plants containing insoluble calcium oxalates (such as Monstera, Philodendron, and Peace Lilies) should be kept out of pets' reach.

Hydrangea (Mophead & Lacecap)

Hydrangea macrophylla

Pruning Window: Mid to Late Spring (after frost risk has passed, March/April)

Pruning Group: RHS Pruning Group 1 (Flowers on Old Wood)

Crucial rule: leave old faded flower heads on the plant all winter to shield the tender emergent buds from severe frost.

Step by Step

Leave flower heads on through winter: The papery dried blooms protect spring buds from windchill and frost.
Spring Head-removal: In late March/April, cut back each stem just above the first pair of healthy, plump green buds beneath the faded flowerhead.
Rejuvenation: On established bushes over 3 years old, cut 1 or 2 of the oldest, thickest stems right down to the ground level to stimulate fresh basal canes.
Acid/Alkaline Soil note: Soil pH affects flower colour (blue in acidic ericaceous soil with aluminium, pink in alkaline lime soil).

Tools Required

Bypass secateurs, Spring mulch

RHS (UK) Notes

RHS H5. Thrives in sheltered borders and moist humus-rich UK woodland soils.

USDA (US) Notes

USDA Zones 5–9. Protect with burlap in northern zones experiencing sub-zero freeze cycles.

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