Starting seeds indoors requires the right equipment to give seedlings the warmth, moisture, and light they need to develop into strong transplants. From basic trays and domes to complete kits with built-in grow lights, the market offers options at every price point. This guide helps you choose the supplies that fit your space, budget, and growing ambitions.
Seed Starting Trays and Cell Packs
Standard 1020 trays are the industry standard for seed starting, measuring approximately 10 by 20 inches. They come with or without drainage holes and hold cell inserts of various sizes. Smaller cells with 72 or 128 cells per tray work for tiny seeds and short-growing seedlings. Larger 36 or 50 cell inserts give roots more room and are better for tomatoes, peppers, and other large transplants. Reusable rigid trays last for years, while flimsy thin plastic inserts may need replacement each season.
Humidity Domes
Clear plastic domes placed over seed trays create a greenhouse effect that maintains humidity for consistent germination. Tall domes with adjustable vents let you regulate airflow as seedlings grow. Remove domes once most seeds have sprouted to prevent damping off disease. Domes are inexpensive at three to eight dollars each and reusable for many seasons when handled carefully.
Heat Mats
Seedling heat mats warm the soil to the optimal germination temperature of 70 to 85 degrees for warm-season crops. They sit under seed trays and use minimal electricity to raise soil temperature about 10 to 20 degrees above room temperature. A thermostat controller is highly recommended to maintain precise temperatures and prevent overheating. Standard 10-by-20 inch mats cost 15 to 30 dollars. Remove heat mats after germination since most seedlings grow better at slightly cooler temperatures.
Self-Watering Seed Starting Systems
Self-watering trays use a reservoir below the cells that wicks moisture upward, maintaining consistent soil moisture without daily attention. This bottom-watering approach reduces damping off risk by keeping the soil surface drier. Systems like the Bootstrap Farmer and similar commercial designs provide professional results with minimal daily maintenance. They cost 20 to 50 dollars per tray system.
Complete Seed Starting Kits
All-in-one kits bundle trays, domes, heat mats, grow lights, and sometimes even seed starting mix into a single purchase. They are convenient for beginners who do not want to research individual components. Kit quality varies widely, so read reviews carefully. Budget kits around 30 to 50 dollars often include adequate trays but weak lighting. Premium kits at 100 to 200 dollars provide better grow lights that produce sturdier seedlings.
Biodegradable Pots
Peat pots, cow pots, and newspaper pots can be planted directly into the garden, reducing transplant shock since roots are never disturbed. However, they can wick moisture away from soil if the rim extends above the soil surface, and some peat pots do not decompose as quickly as advertised. Tear away the top edge of peat pots and make sure the pot is fully buried when transplanting for best results.
Frequently Asked Questions
What is the cheapest way to start seeds?
Repurpose yogurt cups, egg cartons, or toilet paper tubes as seed pots. Use a south-facing window for light and plastic wrap for humidity. A packet of seeds and a bag of seed starting mix costs under ten dollars and can produce dozens of transplants worth hundreds at the garden center.
Are expensive seed starting kits worth it?
The biggest value comes from better lighting. Cheap kits with adequate grow lights produce better results than expensive kits with poor lights. If buying components separately, invest most of your budget in the grow light and spend less on trays and accessories.