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Fertilising guide

How to fertilise Mophead Hydrangea 'Cityline Paris' (Hydrangea macrophylla 'Paris Rapa')— schedule & NPK

Also called Cityline Paris Hydrangea.

More about mophead hydrangea 'cityline paris'

About Mophead Hydrangea 'Cityline Paris'

Hydrangea macrophylla 'Paris Rapa' · also called Cityline Paris Hydrangea · flowering

'Cityline Paris' is a compact dwarf mophead hydrangea bred for patios and small borders, carrying large rounded heads that open bright pink to red and age to attractive green. Naturally tidy at under a metre, disease-resistant and free-flowering, it wants moist, rich soil, dappled light and shelter from harsh afternoon sun.

Growth habit: Compact, rounded, mounding deciduous shrub with glossy mildew-resistant foliage; flowers on old wood (last year's stems) plus some rebloom, so heavy spring pruning sacrifices the early flush.

What fertiliser mophead hydrangea 'cityline paris' actually wants — and why

Mophead Hydrangea 'Cityline Paris' is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for mophead hydrangea 'cityline paris': match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed mophead hydrangea 'cityline paris', and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For mophead hydrangea 'cityline paris':

Feed in spring with a balanced slow-release fertiliser, or one formulated for hydrangeas. A second light feed in early summer supports a long bloom. Avoid heavy nitrogen, which favours leaf over flower. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

The dormant-season rule matters more than the exact interval: skip feeding entirely when mophead hydrangea 'cityline paris' is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for mophead hydrangea 'cityline paris'

Half strength is the safe default for mophead hydrangea 'cityline paris' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

Feeding always goes onto already-damp soil, never dry roots — water mophead hydrangea 'cityline paris' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mophead hydrangea 'cityline paris' watering schedule.

Signs you are over-feeding mophead hydrangea 'cityline paris'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mophead hydrangea 'cityline paris':

Signs you are under-feeding mophead hydrangea 'cityline paris'

If the symptoms point at watering, light or roots rather than nutrition, the full mophead hydrangea 'cityline paris' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of mophead hydrangea 'cityline paris' with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

Organic vs synthetic feeds for mophead hydrangea 'cityline paris'

Organic options

A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.

Synthetic / liquid feeds

A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising mophead hydrangea 'cityline paris' — frequently asked questions

What fertiliser does mophead hydrangea 'cityline paris' need?

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Mophead Hydrangea 'Cityline Paris' is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

How often should I feed mophead hydrangea 'cityline paris'?

Feed in spring with a balanced slow-release fertiliser, or one formulated for hydrangeas. A second light feed in early summer supports a long bloom. Avoid heavy nitrogen, which favours leaf over flower. Feed in spring with a balanced slow-release fertiliser, or one formulated for hydrangeas. A second light feed in early summer supports a long bloom. Avoid heavy nitrogen, which favours leaf over flower. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

What strength of feed for mophead hydrangea 'cityline paris'?

Half strength is the safe default for mophead hydrangea 'cityline paris' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding mophead hydrangea 'cityline paris' look like?

Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding mophead hydrangea 'cityline paris' year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.

Should I flush the soil of mophead hydrangea 'cityline paris'?

Flush the pot of mophead hydrangea 'cityline paris' with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

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