Fertilising guide
How to fertilise Clematis 'The President' (Clematis 'The President')— schedule & NPK
Also called The President clematis, blue-purple clematis.
More about clematis 'the president'
About Clematis 'The President'
Clematis 'The President' · also called The President clematis, blue-purple clematis · flowering
Clematis 'The President' is a vigorous large-flowered climber bearing rich purple-blue blooms up to 15 cm across with silvery undersides and contrasting reddish anthers, flowering in early summer and again in late summer. A dependable Group 2 clematis needing only light spring pruning, it is excellent on walls, trellis and obelisks in sun or part shade.
Growth habit: Deciduous twining climber flowering on old wood in early summer and on new growth later in the year. Pruning Group 2.
What fertiliser clematis 'the president' actually wants — and why
Clematis 'The President' 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 clematis 'the president': 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 clematis 'the president', 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 clematis 'the president':
Hungry plant. Apply a balanced or potassium-rich rose/clematis feed in early spring and again after the first flush, plus an annual mulch of compost or well-rotted manure kept off the stems, to support both flushes of 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 clematis 'the president' 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 clematis 'the president'
Half strength is the safe default for clematis 'the president' — 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 clematis 'the president' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the clematis 'the president' watering schedule.
Signs you are over-feeding clematis 'the president'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for clematis 'the president':
- 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.
Signs you are under-feeding clematis 'the president'
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full clematis 'the president' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of clematis 'the president' 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 clematis 'the president'
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 clematis 'the president' — frequently asked questions
What fertiliser does clematis 'the president' 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. Clematis 'The President' 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 clematis 'the president'?
Hungry plant. Apply a balanced or potassium-rich rose/clematis feed in early spring and again after the first flush, plus an annual mulch of compost or well-rotted manure kept off the stems, to support both flushes of flower. Hungry plant. Apply a balanced or potassium-rich rose/clematis feed in early spring and again after the first flush, plus an annual mulch of compost or well-rotted manure kept off the stems, to support both flushes of 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 clematis 'the president'?
Half strength is the safe default for clematis 'the president' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding clematis 'the president' 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 clematis 'the president' 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 clematis 'the president'?
Flush the pot of clematis 'the president' 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.
Keep reading
- Clematis 'The President' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water clematis 'the president' — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 3899 fertilising guides in the Growli library