Seed Therapy Heirloom Seeds Review

How we rated Seed Therapy

Seeds are one of the few things a review can settle without buying them, because the shop prints what each variety is and what it wants from the growing season against every one it lists. That is where this review stands: the catalogue pages, the policies behind an order and the guarantee that closes it. No packet was bought, sown or germinated to produce it, and nothing here is a germination result of ours.

Where the shop publishes no figure, the review says so instead of filling the gap. Where this review got its information is set out page by page in the Sources block at the end.

Variety and seed quality

The catalogue is the largest part of what is on offer: more than 800 varieties, divided into herbs, vegetables, fruits, flowers and plants, grasses and succulents, trees and shrubs, and a line of microgreens and sprouts. Thirty or so collections stand beside the single varieties, from a beginner garden and a container garden to a pizza garden, a kids’ garden and a survival vegetable garden, which is the shape a first order tends to take.

Each variety carries its own sheet. Shishito pepper is listed as Capsicum annuum at approximately 25 seeds to a packet, heirloom and open-pollinated, annual, 18 to 24 inches tall, 60 days to green and 80 to red, suited to USDA zones 3 to 12 and grown in the United States. True Comfrey is Symphytum officinale at approximately 20 seeds, perennial, 2 to 4 feet, 90 to 120 days to a first leaf harvest, zones 4 to 9, American-grown. The same block appears against every variety, which is what makes one packet comparable with another before either is bought.

Two things sit outside that block. The quantity is described as approximate on every page, so a packet is a number to work from rather than a count, and no germination figure is printed for any variety. The shop states that its seed is vigorously tested to ensure the highest germination rates, and that is the claim; the figure behind it is not on the page.

Sourcing and the Safe Seed Pledge

The origin is named on every variety sheet, and the origin printed across the catalogue is American-grown. Where a variety is not grown in the United States, which the shop says happens mainly when a customer asks for something like eucalyptus, the listing says so rather than leaving the line blank. The About page gives the reasoning: the business describes working with United States farms it has built relationships with, and describes imported seed as the cheaper route it has chosen not to take, on the grounds that it can tell a buyer where its seed was grown, how it was grown and when it was harvested.

The GMO position is published as a pledge rather than a claim. The shop has taken the Safe Seed Pledge, under which it undertakes not to knowingly buy, sell or trade genetically engineered seeds or plants, and the pledge text and the council behind it are reproduced on its own page. Every variety sheet also labels the seed heirloom, open-pollinated and non-GMO.

The part a reader cannot follow up is the farm. No grower is named against a variety, and the account of buying American rather than imported is the shop’s own description of how it works rather than a document a buyer can open. What can be checked is the label on each packet and the pledge, and both are printed.

Growing information on the packet

What comes with the seed is more than a name. Every variety page carries a growing block of its own, and the blocks differ enough to be worth reading: the shishito wants seed started indoors eight to ten weeks before the last frost, a quarter inch deep, at a soil temperature of 80 to 85 °F, moved out once the nights stay above 55 °F, spaced 18 to 24 inches apart in full sun and picked at three to four inches while still green. Comfrey runs the other way, direct-sown in autumn or given thirty days of cold, moist stratification for a spring sowing, at the same quarter-inch depth, thinned to 24 to 36 inches, in sun to part shade.

The packet carries the same material in print. The shop describes its packets as resealable for storage, recyclable and free of plastic, and including the full growing instructions, with a custom packet available for an event. Resealability matters more here than on most products, since seed bought in spring is often carried into the following season.

The frame the instructions are written in is a United States one. Germination temperatures are given in Fahrenheit and the planting windows are keyed to USDA zones and to a last-frost date, so a grower reads them as the conditions the variety wants and then times the sowing to their own season.

Price and value

A single packet is listed from $1.99 to $6.49 across the varieties we checked, against a struck-through reference price running from $3.99 to $12.99, with the collections and bundles above them reaching into the low hundreds. The lower figure is the one being charged: the shishito page shows $1.99 beside $3.99, and comfrey shows $6.49 beside $12.99.

Shipping is what decides an order’s total. First-class shipping with tracking comes free once a basket passes $35, and below that threshold the same service costs $4.99, with priority mail and 24-hour processing at $10. A single packet clears none of that, so the threshold is the reason a basket tends to grow: a buyer ends up spending $35 on seed rather than $4.99 on postage, which is a reasonable trade but not one that saves money.

Pricing here is seasonal, so treat the figures above as the ones the pages carried when we read them in September 2026. A sale running this week may not be running next.

Ordering and after-sale

Orders move quickly outside the spring rush. The shop states that most orders ship within 24 to 48 hours, and that the run from the day after Christmas through April can take longer because that is its seed season, when it says it works around the clock. It also says it holds no year’s stock of pre-packaged seed, so a variety in demand can add a day while a fresh packet is made up. Saturday is not a shipping day with USPS, so an order placed on a Friday can sit until the start of the week.

The guarantee is the strongest part of the offer, and it reads as a guarantee rather than a return window. A buyer has 60 days from delivery, and the shop will refund or replace, whichever is preferred, with shipping excluded from a refund. A return starts with an email to the support address, seeds@southernseeds.com, for approval; the packet then goes to a Frisco, Texas address that still carries the Southern Seeds name, at the buyer’s postage, and the shop asks seven days from receipt before a refund reaches a card within one to two billing cycles. Digital downloads and gift cards are the two things that cannot be returned, and a packet that arrives damaged is handled separately.

Where the offer stops is at the border. The shipping policy states that the shop does not offer international shipping, so an order needs a United States delivery address. Support runs on Central time, Monday to Friday with a shorter Saturday, and the shop says it answers within one business day.

Who Seed Therapy is for

This suits a grower who arrives already knowing which variety they are after, and who would rather read the sheet than trust a picture. The catalogue is wide enough that a first order becomes a set rather than a single packet, and the growing block is written for someone who means to follow it.

It fits three readers less well. Someone outside the United States cannot order, one who wants a germination rate will find a testing claim and no figure, and a buyer after a few common varieties will usually do better at a local counter, where a packet can be held before it is bought and postage does not decide the basket.