Mature size & growth rate

How big does All Blue Potato (Solanum tuberosum 'All Blue') get?

Also called All Blue potato, blue potato, purple-blue potato.

More about all blue potato

About All Blue Potato

Solanum tuberosum 'All Blue' · also called All Blue potato, blue potato · edible

'All Blue' is a maincrop heirloom potato with deep blue-purple skin and dense violet flesh that holds its colour when cooked, thanks to high anthocyanin content. It is grown for boiling, roasting and vivid mash. Plant seed tubers in spring, hill the stems, and harvest tubers once the foliage yellows and dies back.

Mature size: Foliage 50-75 cm (20-30 in) tall and wide; tubers medium, rounded to oblong.

Indoor size vs how big it gets in the wild

All Blue Potato reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back. Indoors and in a pot, expect foliage 50-75 cm (20-30 in) tall and wide. In the ground with no restriction it is a completely different plant — tubers medium, rounded to oblong. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Growth rate and years to mature

All Blue Potato is a fast grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: moderate-to-heavy feeder. incorporate a balanced fertiliser (e.g. 5-10-10) at planting, then side-dress with potassium-rich feed at hilling. avoid excess nitrogen, which drives foliage at the expense of tubers.

Want this turned into the right next pot at the right moment? The pot size calculator and the all blue potato repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast all blue potato grows.

How to keep all blue potato smaller

You are not stuck with the maximum size. For all blue potato specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of all blue potato from the start — that is the most reliable size control for an annual.
Grow it in a smaller container to naturally limit how large it gets.
For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier.
Sow a little later or space plants closer if you specifically want smaller individual plants.

How to grow all blue potato bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for all blue potato the accelerators are:

Full sun, warm soil and steady water are what drive a crop to full size fastest.
Sow at the right time for your zone so it gets the whole season to size up.
Feed appropriately for the crop and never let it check (stall) from drought or cold.

Light is almost always the ceiling. The all blue potato light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When all blue potato outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for all blue potato:

It sprawls beyond its bed or container before harvest — usually a spacing or support issue.
It flops or needs staking once it hits full height.
Once it has fruited or bolted, it is at its final size for good — the next plant is a new sowing.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the all blue potato repotting guide. If you want more of this plant instead of a bigger one, the all blue potato propagation guide turns prunings into new plants.

All Blue Potato size — frequently asked questions

How big does all blue potato get?

All Blue Potato reaches foliage 50-75 cm (20-30 in) tall and wide when grown indoors, and far larger where it grows unrestricted (tubers medium, rounded to oblong.). It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Is all blue potato slow or fast growing?

All Blue Potato is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. All Blue Potato reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back.

How long does all blue potato take to reach full size?

Roughly a single growing season — it reaches full size in one year, then is done. Light, pot size and feeding move that timeline more than anything else.

How do I keep all blue potato smaller?

Choose a compact or dwarf variety of all blue potato from the start — that is the most reliable size control for an annual. Grow it in a smaller container to naturally limit how large it gets. For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier. Sow a little later or space plants closer if you specifically want smaller individual plants.

How can I make all blue potato grow bigger or faster?

Full sun, warm soil and steady water are what drive a crop to full size fastest. Sow at the right time for your zone so it gets the whole season to size up. Feed appropriately for the crop and never let it check (stall) from drought or cold.