GrowSabzHow to grow amaranth in pots
Also called Pigweed, Callaloo, Chinese Spinach, Rajgira · Amaranthus spp.
چولائی
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.8 Levery 3 days, 10 L pot
- 🌡️ Ideal temp
- 20–30°C
- 🪴 Min pot
- 10 L25 cm deep
- 🧺 Harvest
- 30–120days from sowing
- ⚖️ Yield
- 1 kgper 20 L pot
Amaranth is a heat-lover with no tolerance for cold. It wants 20–30 °C and frost kills it outright. Everything about growing it well comes down to timing — getting it into the season early enough to crop before temperatures fall away.
Short answer
Grow amaranth in a 10 litre container at least 25 cm deep, watering about 700 ml per 10 litres of soil every 3 days, and keep temperatures between 20 and 30 °C. First harvest comes 30–120 days after sowing.
Where to plant it
What size pot does amaranth need?
10 litres and 25 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 10 L | 25 cm | Ensure good drainage. Larger pots for larger plants. |
| Grow bag | 10 L | 25 cm | Fabric bags promote air pruning and good drainage. |
| Open ground | — | 30 cm | Space plants adequately for air circulation and growth. |
| Raised bed | 20 L | 30 cm | Excellent for drainage and soil control. |
Watering
How often should you water amaranth?
Every 3 days through the growing season, at about 700 ml per 10 litres of soil — daily in hot weather, every 4 days when it turns cool. Water in the early morning. Drip irrigation or base watering works best.
Too little water
- wilting leaves
- stunted growth
- premature bolting
Too much water
- yellowing leaves
- root rot
- stunted growth
Avoid: standing water; prolonged dryness.
Climate
Can you grow amaranth where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 20 – 30 °C |
|---|---|
| Survives | 5 – 35 °C |
| Germinates above | 18 °C — best at 25 °C, about 7 days |
| Flowers drop | above 38 °C, or below 10 °C |
| Sunlight | 6–12 hrs/day, best 8 |
| Frost | Highly sensitive — will not survive it |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 35 °C and still give you nothing.
How cold is too cold for amaranth? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Amaranth growing stages, day by day
Click any stage to see what's happening. Durations shift with temperature — a warm season runs roughly a quarter faster than a cool one.
Feeding
Fertiliser schedule for amaranth
Feed on the interval below, changing what you give as the plant shifts from making leaves to making fruit.
| Stage | What to use | Per 10 L | Every |
|---|
How to prepare each feed
Common mistakes
Why amaranth fails, and how to avoid it
- A container that is too small
Below 10 litres the root run is too shallow. The plant grows, flowers late, and drops whatever it sets because it cannot support the crop.
- Watering too lightly
A daily splash wets the top few centimetres and nothing else. Amaranth wants about 700 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 38 °C, or below 10 °C, flowers fall before setting. The plant can look perfectly healthy and still give you nothing — shade it through the hottest hours.
- Planting it beside Fennel
Fennel is known to inhibit the growth of many plants, including amaranth, due to allelopathic compounds it releases.
- Leaving it out through a cold snap
Amaranth is highly frost-sensitive. One night below 5 °C can end the plant outright — bring containers in or cover them.
Companions
What to plant with amaranth
Good neighbours
Amaranth can provide ground cover, suppress weeds, and help retain soil moisture. Some varieties can also provide support for climbing amaranth.
Amaranth can help deter potato beetles, which are a common pest for potatoes.
Amaranth can provide shade for peppers in hot climates, protecting them from sunscald and improving soil health.
Beans fix nitrogen in the soil, which benefits amaranth, especially leafy varieties that require nitrogen for growth.
Keep apart from
Fennel is known to inhibit the growth of many plants, including amaranth, due to allelopathic compounds it releases.
Problems
Amaranth pests and diseases
Each lists the weather that brings it on, so you know when to start checking rather than reacting once it's established.
Damping Off humidity >80% · temp 15-20
Seedlings suddenly collapse and die, often at the soil line. Caused by various fungi in overly wet, cool soil.
Aphids humidity any · temp 15-25
Small, soft-bodied insects cluster on new growth and undersides of leaves, sucking sap and causing distorted growth and sticky honeydew.
Leaf Spot humidity >70% · temp 20-30
Various fungi (e.g., Cercospora, Alternaria) cause small, circular spots on leaves, often with dark margins. Can lead to defoliation.
Flea Beetles humidity any · temp >18
Small, jumping beetles that chew tiny, round holes in leaves, giving them a 'shot-hole' appearance. Can severely damage young plants.
Spider Mites humidity <50% · temp >27
Tiny pests that cause leaves to look stippled, pale, and eventually turn yellow and drop. Fine webbing may be visible on undersides.
White Rust humidity >80% · temp 10-20
Causes white, blister-like pustules on the undersides of leaves, often corresponding to yellow spots on the upper surface. Can reduce yield.
Amaranth Weevil humidity any · temp >20
Larvae bore into stems and roots, causing wilting, stunted growth, and sometimes plant death. Adults feed on leaves.
Harvest
When to harvest amaranth
First picking falls between day 30 and day 120, and the plant then keeps producing for about 90 days. Pick often — what you leave on the plant signals it to stop making more.
How to tell it's ready
- Leaves are tender and of desired size (for leafy amaranth)
- Seed heads are dry and seeds easily fall off (for grain amaranth)
How much to expect
Storing it: Leafy amaranth: Refrigerate in a plastic bag for up to a week. Grain amaranth: Dry thoroughly, then store in airtight containers in a cool, dark place.
Questions
Amaranth: common questions
How long does amaranth take to grow?
About 90 days from sowing to the first harvest, with picking usually starting between day 30 and day 120. It then keeps producing for roughly 90 more days. Warm weather pulls that forward; cool weather pushes it back.
What size pot does amaranth need?
At least 10 litres and 25 cm deep for one plant. A raised bed wants 20 litres of soil and 30 cm of depth.
How often should I water amaranth?
About 700 ml per 10 litres of soil, every 3 days in normal weather — daily when it is hot and every 4 days when cool. Water in the early morning.
What temperature does amaranth need?
It does best between 20 °C and 30 °C and survives from 5 °C to 35 °C. Seed needs soil above 18 °C to germinate, ideally around 25 °C.
Can I grow amaranth in winter?
Not outdoors anywhere that frosts — it is highly frost-sensitive and will not survive it. In a frost-free winter it grows slowly; anywhere colder, treat it as a warm-season crop.
How do I know when amaranth is ready to harvest?
Leaves are tender and of desired size (for leafy amaranth); Seed heads are dry and seeds easily fall off (for grain amaranth). Once picked: leafy amaranth: refrigerate in a plastic bag for up to a week. grain amaranth: dry thoroughly, then store in airtight containers in a cool, dark place.
How much does one amaranth plant produce?
Roughly 1 kg from a 20 litre container, or about 3 kg in open ground. Larger containers give proportionally more, up to a point.