🌱 Themis' Gardening School — Part 2: HOW TO PLANT VEGETABLE SEEDS
How to Plant Fruit and Vegetable Seeds — From Seed to Seedling
Welcome to Gardening Lesson 2!
Every large fruit tree and vegetable plant begins its life with a small seed. With suitable soil, moisture, warmth, air and care, a seed can germinate and grow into a healthy young plant.
Today we'll learn how to plant seeds, care for them and transplant seedlings into larger pots or garden beds.
Choose mature, healthy seeds that have been collected and stored correctly.
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Pumpkin and rockmelon seeds should be mature and well-developed.
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Tomato seeds should be cleaned and dried before storage.
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Bean seeds should be mature and free of mould.
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Seeds from packets should be checked for their recommended planting season.
Gardening tip: Not every seed will germinate. Plant a few extra seeds if you need a particular number of plants.
1. Choosing healthy seeds
Before planting, prepare a clean container with suitable growing mix.
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Choose seed trays or small pots with drainage holes.
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Fill them with a good-quality seed-raising mix.
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Moisten the mix lightly before planting.
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Level the surface without pressing it too firmly.
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Label each tray with the seed name and planting date.
Important: Garden soil can be too heavy for small seedlings, especially if it contains a lot of clay. Seed-raising mix usually provides better drainage and aeration.
2. Preparing seed trays, pots and soil
3. Planting seeds at the correct depth
Different seeds require different planting depths.
Vegetable
Approximate planting depth
Pumpkin
2–3 cm
Rockmelon
1–2 cm
Watermelon
2–3 cm
Tomato
0.5 cm
Beans
2–3 cm
Lettuce
Surface to 3 mm, depending on variety
Carrot
0.5–1 cm
Radish
1–1.5 cm
These are general guidelines. Always check the instructions for your particular seed variety.
A useful rule for many seeds is to plant them at approximately twice their thickness. Very small seeds often need only a light covering.
Gardening tip: Planting one seed per tray cell can make transplanting easier because the roots are less likely to become tangled.
4. Watering seeds and keeping them moist
Seeds need moisture to begin germination, but too much water can cause problems.
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Water gently so seeds are not washed out of place.
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Keep the growing mix evenly moist, not waterlogged.
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Allow excess water to drain away.
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Check the soil regularly, especially during warm weather.
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Use a fine spray or water from below when appropriate.
Important: Never leave seed trays sitting in stagnant water for long periods. Excess moisture can encourage root problems and fungal diseases.
5. Germination — When seeds begin to grow
Germination is the process by which a seed begins growing into a new plant.
The first root grows downward into the soil. Next, the shoot emerges above the surface. The first leaves appear, followed by the plant's true leaves.
Vegetable
Typical germination time
Pumpkin
5–10 days
Rockmelon
4–10 days
Watermelon
5–10 days
Tomato
5–10 days
Beans
5–10 days
Lettuce
2–10 days
Carrot
7–21 days
Radish
3–7 days
These are approximate times under suitable conditions. Temperature, moisture, seed age and variety can change how quickly seeds germinate.
6. Caring for young seedlings
Once seedlings emerge, they need adequate light, air circulation, water and growing space.
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Give seedlings plenty of suitable light to prevent weak, stretched stems.
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Protect them from extreme heat, frost and strong wind.
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Keep the soil moist without overwatering.
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Check regularly for insects, slugs and other pests.
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Begin gentle feeding when appropriate for the growing mix and plant.
Gardening tip: The first two leaves on many seedlings are called seed leaves or cotyledons. The leaves that appear afterwards are the true leaves.
As seedlings grow, their roots need more space.
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Wait until the seedlings have developed true leaves and are strong enough to handle.
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Prepare a larger pot with drainage holes and suitable potting mix.
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Moisten the seedling mix before removing the plant.
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Gently lift the seedling, keeping as much of the root system intact as possible.
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Replant at a suitable depth for the species.
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Water gently and protect the plant from harsh conditions while it recovers.
Important: Handle seedlings by a leaf where possible, rather than squeezing their delicate stems. Avoid pulling tangled roots apart forcefully.
7. Transplanting seedlings into larger pots
8. Moving seedlings into the garden
Before moving indoor-grown seedlings outdoors, gradually introduce them to outside conditions. This is called hardening off.
Over approximately 7–10 days, gradually increase their exposure to outdoor light and wind while protecting them from extremes.
When the weather and soil temperature are suitable, transplant them into prepared garden beds or larger containers.
For warm-season plants such as pumpkins, tomatoes and rockmelons, avoid planting outdoors while frost remains a risk.
Remember: Healthy seeds + suitable soil + moisture + warmth + light + careful handling = a strong start for your garden.
🌻 Quick Study Quiz — Lesson 2
Question 1. Why should seed trays have drainage holes?
To allow excess water to escape
To make the soil heavier
To stop seeds growing
Question 2. What are the first leaves on many seedlings called?
Flower leaves
Seed leaves (cotyledons)
Fruit leaves
Question 3. Why is one seed per tray cell often helpful?
It stops germination
It removes the need for watering
It reduces tangled roots
Question 4. What does hardening off mean?
Drying the roots
Gradually introducing seedlings to outdoor conditions
Removing every leaf