When starting a herb garden, one of the first decisions you'll face is whether to grow from seed or buy transplants. Both approaches have genuine merits, and the best answer depends on which herb you're growing, how much time you have, your budget, and your patience for the early stages of growing. This comparison lays out the practical reality: which herbs are genuinely easy from seed, which almost always justify buying transplants, and how to approach timing and cost across both approaches.
Herbs That Are Easy to Grow from Seed
Some herbs germinate quickly, grow fast, and reach harvest size in just a few weeks — making them excellent candidates for direct sowing or starting indoors from seed.
Basil is one of the easiest herbs to grow from seed. It germinates in 5–10 days at soil temperatures of 65–70°F and reaches transplant size in 4–6 weeks. Starting basil from seed is significantly cheaper than buying transplants and allows you to grow interesting varieties (Genovese, Thai, purple, lemon) that nurseries rarely stock as transplants. Sow indoors 6 weeks before your last frost date.
Dill is best grown from seed because it develops a deep taproot early and doesn't transplant well — roots disturbed during transplanting often cause the plant to bolt immediately. Direct sow dill in the garden after your last frost date; it germinates in 7–14 days and reaches harvest size quickly. Succession sow every 3–4 weeks for a continuous harvest.
Cilantro is another direct-sow success: it germinates readily in cool soil (55–65°F is ideal), grows fast, and like dill has a taproot that makes transplanting tricky. Sow in early spring and again in early fall when temperatures are cooler. Cilantro bolts in summer heat, so timing matters more than whether you direct sow or transplant.
Chives grow easily from seed but are slow to reach a usable size — expect 60–80 days from sowing to first harvest. They're worth starting from seed if you're patient, but buying a transplant (or dividing an established clump from a neighbor) gets you to harvest much faster in year one.
Herbs Better Purchased as Transplants
Some herbs are genuinely difficult, slow, or inconsistent from seed — and for these, buying transplants is the more practical and economical choice once you account for time, effort, and seed-starting failure rates.
Rosemary germinates slowly and erratically (2–4 weeks, with low germination rates even under ideal conditions), and seedlings are slow to develop. A rosemary plant large enough to harvest from seed takes 6–12 months. Buying a transplant gets you a harvestable plant immediately and removes months of uncertainty. The extra cost is well justified.
Lavender presents similar challenges: slow germination (14–28 days), seedlings that require precise conditions, and a long time to reach flowering size. Starting lavender from seed also produces variable plants that may not match the variety characteristics you want. Buy named cultivars like Hidcote or Phenomenal as transplants to know exactly what you're getting.
French tarragon cannot be grown from seed at all — true French tarragon is sterile and doesn't produce viable seed. What you find labeled as "tarragon seed" is Russian tarragon, which has inferior flavor. Always buy French tarragon as a named transplant.
Mint can be grown from seed but the seedlings are slow and variable. Given that mint spreads aggressively once established, buying one transplant gives you a spreading colony within a single season anyway — there's little reason to start from seed.
Timing: Starting from Seed vs Buying Transplants
Timing is a real practical consideration for seed starting. Herbs started indoors need the right soil temperature to germinate well — most herbs prefer 65–70°F, though some (cilantro, dill) prefer cooler conditions around 55–65°F. A heat mat under seed trays makes a significant difference for warm-season herbs like basil.
The typical indoor start timing for seed-grown herbs:
Basil: 6 weeks before last frost
Parsley: 8–10 weeks before last frost (slow germinator — soak seeds overnight before sowing)
Chives: 8–10 weeks before last frost
Cilantro and dill: Direct sow outdoors — don't start indoors
Transplants purchased from nurseries are typically ready to go in the ground after your last frost date, bypassing the indoor-growing period entirely. For gardeners without good indoor growing space or a seed-starting setup, transplants are the more practical option for most herbs.
Cost Comparison: Seed vs Transplant
For fast-growing annual herbs, seed starting is significantly cheaper — a $3–4 packet of basil seed contains 50–100 seeds, compared to $5–7 per basil transplant. If you're growing in quantity or trying multiple varieties, the cost savings from seed starting add up quickly.
For perennial herbs that are slow from seed (rosemary, lavender, tarragon), the cost math favors transplants when you factor in the time, heat mat electricity, seed-starting mix, and failure rate. A $7 rosemary transplant vs 6–12 months of effort from seed is an easy calculation for most gardeners.
The middle ground: some herbs (parsley, chives, sage) are moderately easy from seed but slow, and a small pack of transplants is worth it if you want a harvest this season. Start from seed when you want variety selection, quantity, or to save money at scale.
Which Method Is Actually Better?
The honest answer is: it depends on the herb. A useful rule of thumb — if an herb reaches harvest size within 60 days of sowing, it's a good seed candidate. If it takes longer than that to establish and is slow or unreliable from seed, buy transplants. Use both approaches in the same garden: direct sow your dill and cilantro, start basil from seed indoors, and buy your rosemary, lavender, and tarragon as transplants. That combination gives you the best economics and the most reliable results.
Frequently Asked Questions
- Why won't my rosemary seeds germinate?
- Rosemary has naturally low and erratic germination rates — even under ideal conditions, expect only 30–50% germination. The seeds need warmth (70–75°F soil temperature), consistent moisture, and patience of 2–4 weeks. Many experienced gardeners skip rosemary from seed entirely and buy transplants for this reason.
- Can I save herb seeds from my garden?
- Yes, for most open-pollinated annual herbs. Let cilantro, dill, basil, and chives go to seed, then collect and dry the seeds before storing in a cool, dry place. Note that hybrid varieties don't come true from seed. French tarragon produces no viable seed at all and must be propagated by cuttings or division.
- What soil temperature do herb seeds need to germinate?
- Most herbs germinate best at 65–70°F soil temperature. Basil prefers 70–75°F. Cilantro and dill prefer cooler soil — 55–65°F. Parsley germinates at 65–70°F but is notoriously slow (14–28 days); soaking seeds overnight speeds germination.
- Is it worth buying a seed-starting kit for herbs?
- For fast-growing herbs like basil, a basic setup (seed trays, a south-facing window, and standard potting mix) is sufficient. A heat mat is the single most useful investment for germination. For slow herbs like rosemary and lavender, the effort usually isn't worth it — buy those as transplants.