How to Read a Seed Packet
A seed packet may look simple, but it contains most of the instructions you need to grow the plant successfully.
Learning how to read it can save you from planting at the wrong time, too deep, too close together, or in the wrong light.
Variety Name
The packet should tell you both the crop and the variety.
For example:
Tomato — Celebrity
or
Bush Bean — Blue Lake 274
The variety matters because different varieties can vary in:
- Size
- Disease resistance
- Flavor
- Days to maturity
- Growth habit
- Heat tolerance
Days to Maturity
This tells you approximately how long the plant takes to reach harvest.
But read carefully.
For some crops, the clock starts when:
- Seeds are planted
For others, it starts when:
- Transplants are set into the garden
A 75-day tomato does not necessarily produce ripe fruit 75 days after you sow the seed indoors.
Planting Depth
This tells you how deeply to plant the seed.
Small seeds are generally planted shallowly.
Large seeds are usually planted deeper.
Planting too deep can prevent weak seedlings from reaching the surface.
Seed Spacing
The packet may show:
- Initial seed spacing
- Final plant spacing
- Row spacing
These are not always the same.
You may sow seeds closer together and then thin seedlings later.
Row Spacing
Traditional packets often assume row gardening.
In raised beds, you may not use rows at all.
Focus on the final spacing each plant needs.
Sun Requirements
You may see:
- Full sun
- Part sun
- Part shade
For most vegetables, full sun generally means at least 6 hours of direct sunlight, with 8 or more preferred for many fruiting crops.
When to Plant
The packet may say:
- Sow before last frost
- Sow after last frost
- Start indoors 6–8 weeks before last frost
- Direct sow when soil warms
- Plant in late summer for fall harvest
This is where knowing your local Alabama frost dates becomes important.
Germination Time
This tells you how long seeds usually take to sprout under good conditions.
For example:
- 5–10 days
- 7–14 days
- 10–21 days
If nothing happens immediately, that does not mean the seeds failed.
Germination Temperature
Some packets include an ideal soil temperature.
This can be especially useful.
Warm-season crops such as peppers may germinate poorly in cold soil, while lettuce may struggle in excessive heat.
Thin To
If a packet says:
Sow 1 inch apart; thin to 4 inches
That means:
- Plant seeds approximately 1 inch apart.
- Let seedlings emerge.
- Remove weaker seedlings until remaining plants are 4 inches apart.
Thinning feels wasteful, but overcrowded plants often perform poorly.
Plant Height
Knowing mature height helps you plan the garden.
Tall plants can shade shorter ones.
Place taller crops where they will not block needed sunlight.
Harvest Information
Some packets explain when to harvest.
Examples:
- Pick beans while pods are tender.
- Harvest squash while fruit is small.
- Cut lettuce before bolting.
- Harvest root crops at a certain diameter.
Disease Resistance Codes
Tomato and vegetable packets may include letters or abbreviations showing resistance to certain diseases.
These codes can help you choose varieties better suited to local disease pressure.
Open-Pollinated, Hybrid, and Heirloom
You may see terms such as:
Open-Pollinated
Seed can often be saved and produce similar plants if cross-pollination is controlled.
Heirloom
Usually an older open-pollinated variety valued for history, flavor, or tradition.
Hybrid
Produced by controlled crosses between parent lines.
Hybrids may offer advantages such as:
- Disease resistance
- Uniform growth
- Productivity
Saving seed from hybrids may not produce plants identical to the parent.
Packed For Date
Check the packet year.
Seeds do not instantly become useless after one season, but germination rates may decline over time depending on species and storage conditions.
GardenGrowz Tip
Before opening the packet, write down:
- Planting date
- Variety
- Location in the garden
The seed packet tells you how to start.
Your garden journal tells you whether it worked.