The Ultimate Guide to Growing Cucumbers

Growing cucumbers in Australia

The cucumber growing season in Australia depends on your location and the temperature. Plant cucumbers once nights are warm, and the soil has warmed; September–January (temperate), July–March (subtropics), and October–December (cold climates).
So, when should you pick cucumbers in Australia? Make sure you harvest cucumbers between December and March in temperate climates. This should be done between December and February in cool climates and from September to April in tropics and subtropics.

How do cucumbers grow?

Cucumbers grow in stages, starting from seed germination through to fruit harvest. Once planted, cucumber seeds usually sprout within 5 to 10 days. Seedlings quickly develop leaves and strong roots before producing long climbing or trailing vines. As the plant matures, yellow flowers appear. Female flowers have a tiny cucumber-shaped swelling behind the petals, while male flowers grow on thin stems. After pollination, the female flowers develop into fruit.

Cucumbers grow rapidly in warm weather and can be ready to harvest in as little as 8 to 12 weeks from sowing, depending on the variety and growing conditions. Keeping plants well-watered, fed and in full sun helps encourage continuous flowering and fruiting.

Choosing the best cucumbers to grow

Growing cucumbers starts with choosing which varieties to grow.
Cucumbers may be smooth-skinned or with ridges and bumps – the exterior appearance has no bearing on flavour or vigour.
There are three main varieties of cucumber grown in Australia. They are:

• Lebanese – the most popular; generally smooth skinned and seedless
• Continental – the longest type with fruit up to 40cm in length
• Apple – rounded, usually white skinned although there are some green varieties and very crunchy

There are many named varieties available of all three types – check your local garden centre or seed supplier for those best suited to your particular location.

What you'll need to start growing cucumbers

To begin your cucumber-growing journey, you will need:

1. 9cm pots for sowing seeds
2. Seed raising potting mix
3. Spade
4. Compost or soil improver to dig into garden soil

How long do cucumbers take to grow?

Cucumbers usually take 8 to 12 weeks from planting to harvest, depending on the variety, weather and growing conditions. In warm weather with regular watering and feeding, some fast-growing varieties may be ready even sooner.

Cucumber growing timeline

• Seed germination: 5–10 days

• Seedling establishment: 2–3 weeks

• Vine growth: 3–5 weeks

• Flowering begins: 5–7 weeks

• Pollination and fruit set: 6–8 weeks

• First cucumbers ready to harvest: 8–12 weeks

• Ongoing harvest period: Several weeks with regular picking

When to sow your cucumber seeds

You can start your cucumbers off by sowing the seeds in pots. They can be also sown directly into the soil as soon as the soil is warm enough in cool and temperate regions and at the end of the hot, dry season in the tropics. They need a sunny spot protected from strong winds and good soil.

How to grow cucumbers from seed

1. Fill 9cm pots with seed raising mix.
2. Using the dibber (or a pencil), make a hole 2.5cm deep in the centre of the pot.
3. Sow one seed per pot, placing it in the hole on edge rather than flat. This reduces the risk of the seed rotting.
4. Cover with mix and water well.

When sowing cucumber seeds directly into the garden, sow 2.5cm deep, as for pots.

Growing cucumbers in pots

Growing cucumbers in pots is a great option for small gardens, courtyards, balconies and patios. With plenty of sunlight, regular watering and the right container, cucumbers can thrive in pots and produce a generous harvest.

Step 1: Choose the right pot

Select a large pot or container with good drainage holes. Cucumbers grow quickly and need space for their roots, so choose a pot that is at least 40–50cm wide and deep. Larger pots hold moisture better and support stronger growth.

Step 2: Add quality potting mix

Fill the pot with Scotts Osmocote® Tomato, Vegetable & Herb Potting Mix, which already contains fertiliser to help get plants off to a strong start. Avoid using garden soil, which can become compacted in containers.

Step 3: Plant cucumber seeds or seedlings

Plant seeds around 1–2cm deep, or transplant healthy seedlings into the centre of the pot. Water well after planting. If growing more than one plant, ensure there is enough room between them.

Step 4: Position in full sun

Place the pot in a warm, sunny location that receives at least 6 hours of direct sunlight each day. Cucumbers grow best in warm weather and need plenty of light to flower and fruit well.

Step 5: Add support for climbing vines

Most cucumber varieties benefit from a trellis, stake or frame. Supporting vines vertically saves space, improves airflow and helps keep fruit clean and straight.

Step 6: Water regularly

Potted cucumbers dry out faster than garden beds, especially during hot weather. Keep the soil consistently moist, but not waterlogged. Water deeply whenever the top layer of potting mix starts to dry.

Step 7: Feed during the growing season

Feed with Scotts Osmocote Pour+Feed for Tomatoes & Herbs every 1–2 weeks once flowering begins, or apply Scotts Osmocote® Controlled Release Fertiliser: Tomato, Vegetable & Herb less often, following the label - the 1–2 week frequency suits the liquid feed, not the controlled-release option.

Step 8: Harvest often

Pick cucumbers regularly once they reach the desired size. Frequent harvesting encourages the plant to continue flowering and producing more fruit.

How and when to plant cucumbers

Cucumbers that have been sown into individual pots can be planted out into the garden when they are sturdy enough to be handled and when soil and weather conditions are conducive to good growth. You want to be sure the temperature won’t drop below 12-15°C and choose a warm, sunny, sheltered spot.
Harden the seedlings off for a week first by placing them outside in their pots during the day and giving them some protection at night.
Before planting out cucumbers, prepare the soil by digging in potting mix or soil improver, then scatter a quality vegetable and herb fertiliser over the soil at the recommended rate and rake it in.
Plant seedlings 90cm apart and water well. You don’t need to provide supports for them unless you are trying to save space – they will grow happily sprawling across the ground.

How to care for your cucumbers

The key to growing cucumbers is not to stress the plants while they are growing, as this will make the fruits taste bitter. Follow these tips for the best harvest:

• Water regularly, keeping the soil moist but not wet.
• To reduce the risk of fungal disease, keep the leaves of the plants dry.
• Once flowers appear, feed the plants fortnightly with Scotts Osmocote Pour+Feed for Tomatoes & Herbs
• Pinch out the new leaves at the tips of growing shoots when the main stem has produced seven leaves to encourage the plants to put all their energy into producing fruit rather than foliage.
• Pinch out any flowerless side shoots once they have produced seven leaves.

How to pollinate cucumbers

When it comes to pollination, cucumbers (like pumpkins, squash and zucchinis) have a few quirks. One of these is that they produce separate male and female flowers.
It’s easy to tell the male flowers from the female because the male flowers are on thin stems, while the stems of female flowers look like tiny cucumbers (which is what they will develop into).
Some cucumber plants have been bred to produce only female flowers, and these are called all-female plants. Other cucumbers produce both male and female flowers on the same plant.
In the garden veggie patch, cucumbers produce both male and female flowers on the same plant. They need to be pollinated in order to produce fruit. Don’t remove any flowers from the plants, just let the pollinating insects do their thing.

When to pick cucumbers

Most cucumbers are ready to pick around 8–12 weeks after planting, though timing can vary depending on weather and variety. Harvest cucumbers at any stage once the fruits are between 15-20 cm long. Use a sharp knife to cut them from the plant. Pick frequently to encourage the plant to produce more flowers and more fruits.

Once you’ve tasted your own cucumbers fresh from the plant, you’ll never look back.

Common cucumber diseases and pests

Cucumber Growing FAQs

How long do cucumbers take to grow from seed?
Cucumbers usually take 8 to 12 weeks from seed to harvest. Seeds germinate quickly in warm soil, often within 5 to 10 days.

How long do cucumbers take to grow after flowering?
Once flowers are pollinated, cucumbers can develop and mature in as little as 7 to 14 days during warm weather.

How many cucumbers does one plant produce in a season?
A healthy plant can produce multiple cucumbers over several weeks. Regular harvesting encourages ongoing fruit production.

Why are my cucumbers taking a long time to grow?
Slow growth is often caused by cool weather, lack of sunlight, inconsistent watering, poor soil nutrition or lack of pollination. Improving growing conditions usually helps plants recover.

Do cucumbers need pollination to grow?
Most outdoor cucumbers need pollination from insects to develop fruit. Bees transfer pollen from male flowers to female flowers. Some greenhouse or all-female varieties can produce fruit without pollination.

Can cucumbers be grown in pots?
Yes, cucumbers grow very well in pots when given enough sunlight, water and nutrients. Compact or climbing varieties are especially suited to container growing.

What size pot is best for growing cucumbers?
Choose a pot at least 40–50cm wide and deep for one plant. Larger pots are even better, as they hold more soil and moisture.

What are the best cucumbers to grow in pots?
Compact bush varieties and climbing cucumbers both perform well in containers. Choose varieties suited to your space and whether you have vertical support available.