Mature size & growth rate

How big does Telephone Pea (Pisum sativum 'Alderman') get?

Also called Alderman pea, Telephone pea, tall telephone.

More about telephone pea

About Telephone Pea

Pisum sativum 'Alderman' · also called Alderman pea, Telephone pea · edible

'Alderman', also sold as Telephone, is a tall heirloom shelling pea reaching 1.8-2.4 m and needing sturdy support. It yields long pods of large, sweet wrinkle-seeded peas over a long picking window. A cool-season legume, it fixes nitrogen, crops best in spring and autumn, and sulks in summer heat above 24°C.

Mature size: 1.8-2.4 m tall, spreading 15-20 cm per plant when trellised

Watch for — Lodging / collapse: At 2 m-plus the vines topple without strong support. Install tall trellis or netting at sowing and tie in growth regularly.

Indoor size vs how big it gets in the wild

Telephone Pea 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 1.8-2.4 m tall, spreading 15-20 cm per plant when trellised. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

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

Telephone Pea 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: low feeder thanks to nitrogen fixation. work compost into the bed before sowing; if growth is weak, apply a balanced, low-nitrogen feed once at flowering. skip high-nitrogen fertiliser, which delays podding.

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

How to keep telephone pea smaller

You are not stuck with the maximum size. For telephone pea specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of telephone pea 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 telephone pea bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for telephone pea 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 telephone pea light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When telephone pea outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for telephone pea:

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 telephone pea repotting guide. If you want more of this plant instead of a bigger one, the telephone pea propagation guide turns prunings into new plants.

Telephone Pea size — frequently asked questions

How big does telephone pea get?

Telephone Pea reaches 1.8-2.4 m tall, spreading 15-20 cm per plant when trellised when grown indoors. 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 telephone pea slow or fast growing?

Telephone Pea is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Telephone Pea 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 telephone pea 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 telephone pea smaller?

Choose a compact or dwarf variety of telephone pea 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 telephone pea 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.