Starting Seeds Indoors

Let’s talk about indoor seed starting (honestly)

Every winter, gardeners get the itch. Seed catalogs arrive. Instagram fills with perfect little seedlings under purple lights. And suddenly it feels like everyone is starting everything indoors.

But here’s the truth we’ve learned the hard way: Not all seeds are worth starting indoors. Some thrive. Some struggle. And some are honestly more trouble than they’re worth.

If you’re seed starting to save money, get a head start, or grow better plants, this guide will help you decide what’s actually worth your time — and what you should just direct sow or buy as starts.

When does indoor seed starting make sense?

Indoor seed starting is worth it when:

• You want earlier harvests

• You’re growing slow or heat-loving crops

• You want specific or uncommon varieties

• You’re planting a lot and starts would be expensive

It’s usually not worth it when seeds:

• Germinate fast outdoors

• Hate root disturbance

• Cost pennies to replant if something goes wrong

What is worth starting indoors

Tomatoes

Worth it. Every time.

• Long growing season

• Transplant beautifully

• Huge variety options you won’t find as starts

Starting tomatoes indoors gives you:

• Earlier harvests

• Stronger root systems

• Control over varieties (paste, slicers, cherries, heirlooms)

Peppers

Absolutely worth it.

• Slow to germinate

• Love heat

• Expensive as nursery starts

Peppers benefit from:

• Heat mats - This improved our success rate

• Consistent light

• Extra time before transplant

This is one of the biggest cost-savers if you grow a lot of them.

Brassicas (broccoli, kale, cabbage, cauliflower)

Worth it — especially in warm climates.

• Better timing control

• Strong transplants help beat pests

• Easier succession planting

Indoor starts let you:

• Transplant at the right moment

• Avoid seedling loss to birds and bugs

Herbs (some of them)

Worth it selectively.

Good indoor candidates:

• Basil

• Thyme

• Oregano

• Parsley

Not worth the effort:

• Cilantro (bolts fast)

• Dill (taproot hates transplanting)

What’s usually not worth starting indoors

Root crops (carrots, radishes, beets)

Skip it.

• Taproots hate disturbance

• Direct sowing works better

• Faster and more reliable outdoors

If it grows underground — it probably wants to stay there from day one.

Corn

Not worth it.

• Fast outdoor germination

• Poor transplant success

• Needs to be planted in blocks anyway

Beans & peas

Generally no.

• Cheap seeds

• Fast growers

• Better yields from direct sowing

The exception: short-season climates with very tight windows.

Cucurbits (squash, melons, cucumbers)

Borderline — depends on your setup.

They:

• Germinate fast

• Grow aggressively

• Outgrow trays quickly

If you do start them indoors:

• Use larger cells

• Transplant young

• Handle gently

Otherwise, direct sowing is easier.

What actually matters more than the seeds

Indoor seed starting success isn’t about fancy gear — it’s about three basics:

1. Light (this is the big one)

• Bright window ≠ enough

• Leggy seedlings = not enough light

• Simple shop lights work great

2. Timing

Starting too early causes:

• Weak plants

• Root-bound seedlings

• Transplant shock

Start based on weeks before last frost, not excitement.

3. Volume

Indoor seed starting makes more sense when:

• You’re planting many of the same crop

• You want consistency across beds or rows

Starting two plants indoors? Probably not worth it.Starting forty? Absolutely.

Our Rareloom rule of thumb

We ask ourselves three questions before starting anything indoors:

1. Does this transplant well?

2. Is it slow or heat-loving?

3. Will I grow enough of it to justify the effort?

If it hits at least two — it’s worth starting inside.

Final takeaway

Indoor seed starting is a tool, not a requirement.

Used right, it saves money, expands variety, and improves timing. Used wrong, it creates stress, clutter, and disappointing plants.

Start the crops that benefit. Direct sow the rest. Don’t let social media convince you everything needs a grow light.

If you want to see the trays, lights, and setups that have actually worked for us, we’ll link them below 👇(affiliate links help support Rareloom at no extra cost to you)

• Heat Mat that really changed our pepper germination success: https://amzn.to/4aW3QF9

• Seed starting trays with humidity domes: https://amzn.to/4aW3QF9 these work great but also if you are doing things at scale I recommend checking out Greenhouse Megastore for trays and such.

• LED Lights can get expensive. We have purchased "official" plant LED's (as seen here https://amzn.to/4aW3QF9) but as we grew and are starting for a small farm plus plant sales we went the route of buying longer LED shop lights which work to hold the baby plants over until they can go outside.