Starting Plants From Seed
Growing plants from seed is one of the most useful gardening skills. It gives you access to many varieties and lets you control the early stages of plant development.
What You Need
Basic seed-starting supplies include seeds, clean containers with drainage, a suitable seed-starting medium, water, light, and labels.
Starting Seeds Indoors
Fill containers with a suitable growing medium. Plant seeds at the depth recommended on the packet and moisten the medium without saturating it.
Provide appropriate temperature and light. Many seedlings need much stronger light than a typical room provides, so a suitable grow light may be necessary.
Caring for Seedlings
Keep the growing medium appropriately moist. Avoid allowing seedlings to remain constantly saturated.
As seedlings grow, provide enough space and light. Crowded plants may become weak and stretched.
Thinning
If several seedlings emerge in one location, remove excess seedlings when the instructions call for thinning. Leaving every seedling can result in weak, crowded plants.
Transplanting
When seedlings have developed sufficiently, move them into larger containers or into the garden according to their requirements.
Handle seedlings carefully and avoid unnecessary root disturbance.
Hardening Off
Indoor-grown seedlings should gradually become accustomed to outdoor conditions. Increase exposure to outdoor light, wind, and temperature over a period of days rather than moving delicate seedlings directly into harsh conditions.
Common Problems
Poor germination may result from incorrect temperature, moisture, depth, or old seed. Weak seedlings often result from insufficient light.
Mold can develop when conditions remain excessively wet and poorly ventilated.
Choosing a Seed-Starting Location
A good seed-starting area provides adequate light, stable temperatures, clean containers, and convenient access to water.
Weak light is one of the most common causes of poor indoor seedlings. A sunny window may work for some plants, but many seedlings become elongated when light is insufficient.
A Basic Seed-Starting Sequence
- Fill a clean container with suitable growing medium.
- Moisten the medium.
- Plant the seed at the recommended depth.
- Label the container.
- Maintain suitable temperature and moisture.
- Provide adequate light after emergence.
- Thin or transplant as needed.
- Harden off before outdoor planting.
Seedling Problems
| Symptom | Possible causes |
|---|---|
| No germination | Wrong temperature, depth, moisture, or poor seed |
| Long, thin stems | Insufficient light |
| Seedlings collapse at soil line | Excess moisture or disease |
| Yellow seedlings | Root problems, nutrition, or insufficient light |
| Dry, wilted seedlings | Insufficient moisture or damaged roots |
Hardening Off
Outdoor conditions are more demanding than indoor conditions. Wind, direct sunlight, and temperature changes can stress tender seedlings.
Gradually expose plants to outdoor conditions, increasing exposure over several days while monitoring their response.
Timing Is Important
Starting seeds too early can create large plants that are difficult to maintain indoors. Starting too late can delay harvest.
Use the crop's growing requirements and local planting conditions to determine timing rather than starting everything on the same date.
Conclusion
Starting Plants From Seed is a skill that becomes easier with practice. Use the principles in this guide as a foundation, observe how they apply in your own garden, and adjust your approach as you gain experience.