Microgreens are young, edible vegetable and herb seedlings, harvested when they are only a few inches tall. They offer a concentrated burst of flavor and nutrients, and are remarkably easy to grow at home, providing a fresh, healthy harvest in just one to three weeks. Starting your own microgreen garden requires minimal space and effort, making it a perfect project for any plant enthusiast.
What are Microgreens and Why Should You Grow Them?
Microgreens are essentially baby plants, harvested after the first true leaves have emerged but before they fully mature. They are not to be confused with sprouts, which are germinated seeds consumed before they develop leaves, or baby greens, which are slightly older and larger. Microgreens are renowned for their intense flavors, vibrant colors, and impressive nutritional density, often containing higher levels of vitamins, minerals, and antioxidants than their mature counterparts.
Growing microgreens offers several compelling benefits. Firstly, they provide a quick turnaround, with most varieties ready for harvest in 7 to 21 days, making them ideal for instant gratification. Secondly, they are incredibly versatile, perfect for adding a nutritious crunch to salads, sandwiches, smoothies, or as a vibrant garnish. Lastly, they are a fantastic way to enjoy fresh, organic produce right from your kitchen, regardless of the season or outdoor space.
How Do I Choose the Right Seeds and Supplies for Microgreens?
Selecting the right seeds and supplies is key to a successful microgreen harvest. You'll need specific seeds, appropriate growing trays, and a suitable growing medium.
Which Seeds are Best for Growing Microgreens?
Not all seeds are equally suited for microgreen cultivation. Opt for varieties specifically sold as microgreen seeds, as these are typically untreated and tested for high germination rates. Some excellent beginner-friendly options include:
Radish (Raphanus sativus): Grows very fast and has a peppery kick.
Broccoli (Brassica oleracea var. italica): Mild flavor, packed with nutrients.
Kale (Brassica oleracea var. sabellica): Earthy taste, robust and healthy.
Sunflower (Helianthus annuus): Nutty and crunchy, requires soaking.
Pea (Pisum sativum): Sweet and tender, also benefits from soaking.
Avoid using garden seeds that may be treated with fungicides or pesticides, as these are not meant for consumption in their immature stage.
What Kind of Trays and Growing Medium Should I Use?
For trays, shallow planting trays (2-4 inches deep) are ideal. Look for trays with drainage holes, and consider bottom trays without holes to catch excess water if you plan on bottom-watering. As for the growing medium, a fine-textured, soilless mix is best. This could be a specialized seed-starting mix, coco coir, or a peat-based blend. These mediums provide good aeration and moisture retention without being too heavy or compact, which can hinder delicate microgreen roots.
How Do I Plant and Care for My Microgreens?
Once you have your seeds and supplies, planting microgreens is a straightforward process. Planta recommends these simple steps:
Prepare your trays: Fill your shallow trays with about 1-2 inches of your chosen growing medium. Gently level and lightly tamp it down to create an even surface.
Sow your seeds: Scatter your microgreen seeds densely and evenly across the surface of the growing medium. Unlike regular gardening, you want a high density of seeds to achieve a lush crop. For very small seeds, a shaker can help. For larger seeds like sunflower or pea, soak them for 8-12 hours prior to planting to aid germination.
Cover lightly (optional): For most seeds, you can lightly mist the seeds with water and then cover them with a very thin layer of growing medium, or simply leave them exposed. Some larger seeds, like sunflower or pea, benefit from being covered with another tray for a few days to promote germination in darkness, creating a 'blackout' period.
Initial watering: Gently mist the surface with water until it is thoroughly moist, but not waterlogged. A spray bottle is excellent for this. For bottom-watering, place the planted tray into a slightly larger tray filled with about an inch of water, allowing the medium to absorb water from below.
Germination period: During the first 2-4 days, keep the trays in a dark place or cover them to maintain humidity and encourage germination. Check daily to ensure the medium stays consistently moist.
What Are the Light, Water, and Temperature Needs of Microgreens?
After germination, your microgreens will need consistent light, water, and appropriate temperatures to thrive.
What is the Best Lighting for Microgreens?
Once your seeds have germinated and the first tiny leaves emerge (often pale yellow or white from being in darkness), it's time to introduce them to light. Microgreens require bright, indirect light for 12-16 hours per day. A south-facing window can work, but for best results and consistent growth, use a fluorescent shop light or a dedicated LED grow light positioned just a few inches above the trays. This prevents them from becoming leggy and stretching for light, ensuring strong, healthy stems and vibrant color.
How Often Should I Water My Microgreens?
Consistency is key when watering microgreens. The growing medium should remain consistently moist, but never soggy. Overwatering can lead to mold and damping-off disease, while underwatering causes wilting. The best method for watering microgreens is often bottom-watering. This involves placing your growing tray (with drainage holes) into a larger tray containing about an inch of water. Let it sit for 10-15 minutes, allowing the medium to absorb water from below, then remove the tray. This prevents disturbing the delicate seedlings and helps maintain an even moisture level. Water every 1-2 days, or as needed, checking the weight of the tray to gauge moisture levels, a light tray indicates it's time for water.
What Temperature Do Microgreens Prefer?
Most microgreens thrive in standard room temperatures between 18-24 °C (65-75 °F). Avoid extreme fluctuations in temperature, as this can stress the young plants. Good air circulation is also important to prevent fungal issues; a small fan can be helpful, but avoid direct strong drafts.
When and How Do I Harvest My Microgreens?
Harvesting is the most rewarding part of growing microgreens! Most varieties are ready to harvest within 7-21 days of planting, depending on the specific type.
When are Microgreens Ready to Harvest?
Your microgreens are ready when they have developed their cotyledons (the first seed leaves) and, for many varieties, their first set of true leaves. At this stage, they typically stand 2-4 inches tall. Different varieties mature at different rates; for example, radish microgreens are often ready in about 7-10 days, while pea shoots might take 10-14 days, and sunflowers up to 14-21 days. Taste testing a small amount can also help you determine the optimal harvest time for flavor and texture.
What is the Best Way to Harvest Microgreens?
To harvest, use a clean, sharp pair of scissors or a knife. Gently grasp a small bunch of microgreens and cut them just above the soil line, ensuring you don't pick up any growing medium. Once harvested, most microgreen varieties will not regrow, so you typically get one single harvest per tray. Enjoy them immediately for the freshest flavor and maximum nutritional benefits!
Growing microgreens at home is a simple, rewarding journey that brings fresh, nutritious flavor directly to your table. With a few basic supplies and consistent care, you can enjoy a continuous supply of these superfoods, enhancing both your diet and your gardening skills. Happy growing!