Fertilising guide
How to fertilise Sweet 100 Cherry Tomato (Solanum lycopersicum 'Sweet 100')— schedule & NPK
Also called Sweet 100 tomato, Sweet 100 cherry.
More about sweet 100 cherry tomato
About Sweet 100 Cherry Tomato
Solanum lycopersicum 'Sweet 100' · also called Sweet 100 tomato, Sweet 100 cherry · edible
'Sweet 100' is a vigorous indeterminate cherry tomato famed for very high sugar levels and enormous yields of small, round, intensely sweet red fruit borne in long branching trusses of a hundred or more. The tall vines crop prolifically from midsummer until frost. A frost-tender warm-season annual needing full sun, support and steady moisture.
Growth habit: Indeterminate (vining) habit, growing tall and cropping continuously until frost; requires tall support, a cane or string, and side-shoot management.
What fertiliser sweet 100 cherry tomato actually wants — and why
Sweet 100 Cherry Tomato feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen.
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 sweet 100 cherry tomato: 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 sweet 100 cherry tomato, 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 sweet 100 cherry tomato:
Balanced fertiliser at planting, then a high-potassium tomato feed weekly once fruiting starts; the heavy crop benefits from regular feeding. Curb nitrogen once flowering to favour fruit over foliage. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
The dormant-season rule matters more than the exact interval: skip feeding entirely when sweet 100 cherry tomato 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 sweet 100 cherry tomato
Follow the crop-feed label rate for sweet 100 cherry tomato — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
Feeding always goes onto already-damp soil, never dry roots — water sweet 100 cherry tomato first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the sweet 100 cherry tomato watering schedule.
Signs you are over-feeding sweet 100 cherry tomato
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for sweet 100 cherry tomato:
- Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
- Lush foliage hiding the crop; soft growth prone to pests and disease.
- Salt crust on the soil and scorched leaf edges in containers.
Signs you are under-feeding sweet 100 cherry tomato
- Pale, yellowing lower leaves and stunted growth.
- Small fruit, poor set, and a quickly exhausted plant.
- Blossom-end rot and weak cropping from erratic or insufficient feeding.
If the symptoms point at watering, light or roots rather than nutrition, the full sweet 100 cherry tomato care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
In containers, fertiliser salts build up fast — water sweet 100 cherry tomato thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Organic vs synthetic feeds for sweet 100 cherry tomato
Organic options
Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.
Synthetic / liquid feeds
A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.
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 sweet 100 cherry tomato — frequently asked questions
What fertiliser does sweet 100 cherry tomato need?
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. Sweet 100 Cherry Tomato feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
How often should I feed sweet 100 cherry tomato?
Balanced fertiliser at planting, then a high-potassium tomato feed weekly once fruiting starts; the heavy crop benefits from regular feeding. Curb nitrogen once flowering to favour fruit over foliage. Balanced fertiliser at planting, then a high-potassium tomato feed weekly once fruiting starts; the heavy crop benefits from regular feeding. Curb nitrogen once flowering to favour fruit over foliage. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
What strength of feed for sweet 100 cherry tomato?
Follow the crop-feed label rate for sweet 100 cherry tomato — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
What does over-feeding sweet 100 cherry tomato look like?
Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once sweet 100 cherry tomato starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.
Should I flush the soil of sweet 100 cherry tomato?
In containers, fertiliser salts build up fast — water sweet 100 cherry tomato thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Keep reading
- Sweet 100 Cherry Tomato care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water sweet 100 cherry tomato — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise tomato
- How to fertilise pepper
- How to fertilise cucumber
- All 2464 fertilising guides in the Growli library