GrowSabzHow to grow calendula in pots
Also called Pot Marigold, Garden Marigold, Ruddles, Scotch Marigold · Calendula officinalis
گل اشرفی
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.3 Levery 3 days, 5 L pot
- 🌡️ Ideal temp
- 15–24°C
- 🪴 Min pot
- 5 L15 cm deep
- 🧺 Harvest
- 45–60days from sowing
- ⚖️ Yield
- 0.2 kgper 20 L pot
Calendula keeps producing once it starts. First picking comes around day 45, and the plant then crops for roughly 120 more days — but only if you keep picking. Blooms left on the plant is a signal to stop making more.
Short answer
Grow calendula in a 5 litre container at least 15 cm deep, watering about 500 ml per 10 litres of soil every 3 days, and keep temperatures between 15 and 24 °C. First harvest comes 45–60 days after sowing.
Where to plant it
What size pot does calendula need?
5 litres and 15 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 5 L | 15 cm | Good drainage is essential |
| Grow bag | 5 L | 15 cm | Fabric bags promote air pruning |
| Open ground | — | 20 cm | Space plants for air circulation |
| Raised bed | 10 L | 20 cm | Excellent for drainage and soil control |
Watering
How often should you water calendula?
Every 3 days through the growing season, at about 500 ml per 10 litres of soil — daily in hot weather, every 5 days when it turns cool. Water in the early morning. Base of plant, avoid overhead works best.
Too little water
- wilting leaves
- reduced flowering
- stunted growth
Too much water
- yellowing leaves
- stem rot
- stunted growth
Avoid: overhead watering; standing water; soggy soil.
Climate
Can you grow calendula where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 15 – 24 °C |
|---|---|
| Survives | -5 – 30 °C |
| Germinates above | 18 °C — best at 21 °C, about 10 days |
| Flowers drop | above 28 °C |
| Sunlight | 6–10 hrs/day, best 8 |
| Frost | Medium sensitivity |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 30 °C and still give you nothing.
How cold is too cold for calendula? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Calendula 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 calendula
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 calendula fails, and how to avoid it
- A container that is too small
Below 5 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. Calendula wants about 500 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 28 °C flowers fall before setting. The plant can look perfectly healthy and still give you nothing — shade it through the hottest hours.
- Harvesting too late
Left too long the colour changes, seeds harden and the flavour sharpens. Pick on the signs listed below, not on the calendar.
- Planting it beside Fennel
Fennel produces substances from its roots that can inhibit the growth of many nearby plants, including calendula.
Companions
What to plant with calendula
Good neighbours
Attracts beneficial insects like ladybugs and hoverflies that prey on tomato pests, and can deter nematodes.
Attracts beneficial insects to the garden, which can help control pests affecting asparagus. Also deters nematodes.
Attracts beneficial insects like lacewings and parasitic wasps, which help control common garden pests.
Calendula can act as a trap crop for aphids, drawing them away from roses, and its strong scent may deter them.
Attracts pollinators and beneficial insects, contributing to overall garden health and potentially deterring some pests.
Keep apart from
Problems
Calendula 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.
Aphids humidity any · temp 15-25
Small, soft-bodied insects that cluster on new growth and the undersides of leaves, sucking sap and secreting sticky honeydew. Can cause distorted growth and sooty mold.
Whiteflies humidity >60% · temp >25
Tiny, white, winged insects that fly up when the plant is disturbed. They suck sap, weaken the plant, and can transmit viruses. Often found on the undersides of leaves.
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 the undersides of leaves in severe infestations.
Powdery Mildew humidity 50-70% · temp 20-27
White, powdery fungal spots appear mainly on the upper surface of leaves. Causes leaves to yellow, distort, and die off prematurely, reducing vigor and flowering.
Leaf Spot humidity >70% · temp 18-28
Various fungal or bacterial leaf spots can appear as small, dark, circular lesions on leaves, often with a yellow halo. Can lead to defoliation.
Root Rot humidity any · temp any
Caused by overwatering or poorly draining soil, leading to wilting, yellowing leaves, and eventual plant collapse as roots decay. Prevent with good drainage.
Slugs Snails humidity >80% · temp 10-20
These mollusks chew irregular holes in leaves, especially on young seedlings. Look for slime trails as evidence of their presence.
Aster Yellows humidity any · temp 18-30
A serious, incurable disease transmitted by leafhoppers. Symptoms include yellowing leaves, stunted growth, distorted and green flowers, and witches' broom formations. Remove infected plants immediately.
Harvest
When to harvest calendula
First picking falls between day 45 and day 60, and the plant then keeps producing for about 120 days. Pick often — what you leave on the plant signals it to stop making more.
How to tell it's ready
- Fully open flowers with vibrant color, before they start to go to seed.
How much to expect
Storing it: Fresh flowers can be stored in a vase with water for a few days. For longer storage, dry the petals or whole flower heads in a dark, well-ventilated area.
Questions
Calendula: common questions
How long does calendula take to grow?
About 60 days from sowing to the first harvest, with picking usually starting between day 45 and day 60. It then keeps producing for roughly 120 more days. Warm weather pulls that forward; cool weather pushes it back.
What size pot does calendula need?
At least 5 litres and 15 cm deep for one plant. A raised bed wants 10 litres of soil and 20 cm of depth.
How often should I water calendula?
About 500 ml per 10 litres of soil, every 3 days in normal weather — daily when it is hot and every 5 days when cool. Water in the early morning.
What temperature does calendula need?
It does best between 15 °C and 24 °C and survives from -5 °C to 30 °C. Seed needs soil above 18 °C to germinate, ideally around 21 °C.
Can I grow calendula in winter?
It tolerates cold better than most, down to about -5 °C, so a sheltered spot or a cold frame will often carry it through.
How do I know when calendula is ready to harvest?
Fully open flowers with vibrant color, before they start to go to seed.. Once picked: fresh flowers can be stored in a vase with water for a few days. for longer storage, dry the petals or whole flower heads in a dark, well-ventilated area.
How much does one calendula plant produce?
Roughly 0.2 kg from a 20 litre container, or about 0.5 kg in open ground. Larger containers give proportionally more, up to a point.