Fertilising guide
How to fertilise La Ratte Fingerling Potato (Solanum tuberosum 'La Ratte')— schedule & NPK
Also called La Ratte potato, French fingerling potato, asparges potato.
More about la ratte fingerling potato
About La Ratte Fingerling Potato
Solanum tuberosum 'La Ratte' · also called La Ratte potato, French fingerling potato · edible
'La Ratte' is a classic French fingerling with small, knobbly, elongated tubers, yellow waxy flesh and a distinctive nutty, chestnut-like flavour. A chef's favourite for steaming, salads and warm sides, it holds shape when cooked. This maincrop variety is planted from seed tubers in spring and lifted in late summer once the haulm dies back.
Growth habit: Herbaceous annual with a moderately sprawling haulm; sets numerous small, elongated fingerling tubers on stolons that need hilling.
What fertiliser la ratte fingerling potato actually wants — and why
La Ratte Fingerling Potato stores its crop underground, so the rule is the reverse of leafy plants — go easy on nitrogen, which sends energy into tops at the expense of roots.
Low-nitrogen, with modest phosphorus and potassium for root development — ideally compost-improved soil rather than a high-N feed. Excess nitrogen forks the roots and grows lush tops instead of a crop.
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 la ratte fingerling potato: 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 la ratte fingerling potato, 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 la ratte fingerling potato:
Moderate feeder. Add balanced fertiliser and compost at planting, then side-dress with potassium at hilling. Avoid heavy nitrogen, which produces lush tops and fewer, poorly flavoured tubers. In practice: prepare the bed with well-rotted compost (not fresh manure), then little or no extra feeding through the season (spring through early autumn); a light potassium feed mid-growth at most.
The dormant-season rule matters more than the exact interval: skip feeding entirely when la ratte fingerling potato 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 la ratte fingerling potato
Less is more for la ratte fingerling potato. If you feed at all, keep it light and low-nitrogen — the soil preparation does the work, and over-feeding actively spoils the crop.
Feeding always goes onto already-damp soil, never dry roots — water la ratte fingerling potato first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the la ratte fingerling potato watering schedule.
Signs you are over-feeding la ratte fingerling potato
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for la ratte fingerling potato:
- Large lush leafy tops and small, forked or hairy roots.
- Split or cracked roots from a nitrogen-and-water surge.
- All foliage and no usable crop at harvest.
Signs you are under-feeding la ratte fingerling potato
- Genuinely uncommon in reasonable soil — these are not hungry plants.
- Pale, weak tops and small roots only in very poor, exhausted ground.
- Slow growth across the whole bed in long-uncultivated soil.
If the symptoms point at watering, light or roots rather than nutrition, the full la ratte fingerling potato care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flushing is not the issue for la ratte fingerling potato — the equivalent care is avoiding fresh manure and high-N feeds entirely, and rotating beds so the soil is not over-rich from a previous hungry crop.
Organic vs synthetic feeds for la ratte fingerling potato
Organic options
Well-rotted compost worked in the season before, or for a previous crop, is ideal — never fresh manure. UK: garden compost, low-N blends; US: Espoma Garden-tone sparingly or finished compost. Lean and well-worked beats rich.
Synthetic / liquid feeds
If anything, a low-nitrogen, potassium-leaning feed only — UK: a high-potash feed mid-season at most, never a general high-N; US: a 5-10-10 sparingly. Most root crops crop best with no synthetic feed at all.
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 la ratte fingerling potato — frequently asked questions
What fertiliser does la ratte fingerling potato need?
Low-nitrogen, with modest phosphorus and potassium for root development — ideally compost-improved soil rather than a high-N feed. Excess nitrogen forks the roots and grows lush tops instead of a crop. La Ratte Fingerling Potato stores its crop underground, so the rule is the reverse of leafy plants — go easy on nitrogen, which sends energy into tops at the expense of roots.
How often should I feed la ratte fingerling potato?
Moderate feeder. Add balanced fertiliser and compost at planting, then side-dress with potassium at hilling. Avoid heavy nitrogen, which produces lush tops and fewer, poorly flavoured tubers. Moderate feeder. Add balanced fertiliser and compost at planting, then side-dress with potassium at hilling. Avoid heavy nitrogen, which produces lush tops and fewer, poorly flavoured tubers. In practice: prepare the bed with well-rotted compost (not fresh manure), then little or no extra feeding through the season (spring through early autumn); a light potassium feed mid-growth at most.
What strength of feed for la ratte fingerling potato?
Less is more for la ratte fingerling potato. If you feed at all, keep it light and low-nitrogen — the soil preparation does the work, and over-feeding actively spoils the crop.
What does over-feeding la ratte fingerling potato look like?
Large lush leafy tops and small, forked or hairy roots. Split or cracked roots from a nitrogen-and-water surge. All foliage and no usable crop at harvest. Feeding la ratte fingerling potato a nitrogen-rich fertiliser, or planting into freshly manured ground, is the defining mistake — you get a forest of leafy tops and forked, hairy, split or all-leaf-no-root crops.
Should I flush the soil of la ratte fingerling potato?
Flushing is not the issue for la ratte fingerling potato — the equivalent care is avoiding fresh manure and high-N feeds entirely, and rotating beds so the soil is not over-rich from a previous hungry crop.
Keep reading
- La Ratte Fingerling Potato care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water la ratte fingerling potato — 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 3899 fertilising guides in the Growli library