[Vegetables and greenhouse](https://dunger.ua/en/blog/categories/vegetables-and-greenhouse) # When and how to feed cabbage seedlings for the first time Published 2026-11-09 Updated 2026-11-09 To read 7 min Check the potting mix, the first true leaves, moisture and lighting before choosing a fertilizer for cabbage seedlings in trays. Work out whether cabbage seedlings need their first feed by checking the potting mix and the plants in front of you. Even, green seedlings growing in a mix with a starter fertilizer may need more time before anything is added. A seed-starting medium with little or no added nutrition needs an earlier review, once the seed leaves are open and you can see how the true leaves are developing. Start with the bag label, the condition of the root ball and the light across the tray. Those observations can separate a feeding decision from a problem with watering, temperature or potting on. ### Before feeding a tray of cabbage seedlings - Check the potting mix bag for an initial fertilizer charge. - Compare the center of the tray with the edge and the cells nearest the glass. - Check moisture below the surface and make sure extra water can escape. - Check whether the seed leaves have opened and the true leaves are starting to develop. - Record recent watering, pricking out and any change to the lighting. ## When cabbage seedlings are ready for their first feed Cabbage produces a pair of seed leaves, called cotyledons, before the true leaves emerge between them. Write down when your seedlings appeared, then judge them by what you can see on the tray. Some cells may have a growing true leaf while seedlings in others are still breaking the surface. They are at different stages. Check actively growing plants with open seed leaves in an uncharged mix before applying the same decision to an even tray growing steadily in a prepared mix. In a Ukrainian spring, cabbage started by a window, in an insulated balcony enclosure or in a heated greenhouse will develop under different conditions. The mix by cold glass may stay wet longer, while the outer cells near a lamp or a warm air current may dry earlier. Compare a few cells and check the conditions by the seedlings at night as well as by day. The timing for feeding depends on how those plants are actually growing. Judge the timing for planting outdoors separately, against the local forecast and the progress of hardening off. After pricking out, check what is already in the new mix and give the roots time to recover. Mark seedlings growing in different mixes separately. ## What to look for on the potting mix label ### Mix with a starter charge Find the list of ingredients and the intended use on the bag. Look for an added fertilizer, any duration given for its supply and instructions about when to start supplementary feeding. Keep a photograph of the label if you store unused mix in a different container. Even color and continuing new leaves under suitable light and moisture are reasons to observe a little longer. Consider supplemental feeding when you can judge both what is already in the mix and what the plants need at their current stage. ### Mix without added nutrients A seed-starting medium can supply water and air while holding little nutrition of its own. Check what the manufacturer actually added. Once the cotyledons have opened, start observing growth. If true leaves are beginning to expand and light, moisture and roots are in order, consider a liquid fertilizer whose directions include seedlings. Think about the next move too. The decision in a sowing tray can differ from the decision just after you move the seedlings into fresh, nutrient-charged mix. Compare the weight and moisture of a few plugs without breaking apart every seedling. If the tray feels light and the mix is dry inside, see whether your regular watering wets it evenly. If water stays in the tray below, empty it, check the drainage openings and look again before feeding. A small plug has little volume to buffer uneven watering. Correct any drainage problem before introducing another variable. A watering can with a gentle outlet makes it easier to wet selected plugs without shifting the seedlings or washing mix from their roots. ## Problems that can look like a feeding shortage Check the light first if the stems are thin and stretched on one side. If they lean in the same direction, compare the distance from the light across the whole tray. Where pale seedlings have been standing in a cold, wet spot, inspect the base of the stems and the mix at the same time. Mark whether the change affects the whole tray or begins in a few adjacent cells. The distribution tells you where to investigate first. When stems collapse or look dark and narrowed at the surface, separate affected seedlings and review watering, cleanliness and the condition of the mix. That symptom calls for a different diagnosis from gradual paling in seedlings that are otherwise still growing. A few plants may wilt briefly after pricking out. Before changing their feeding, check that the mix surrounds the roots and watch whether growth restarts under suitable conditions. Consider excess soluble salts if the plants have already received several feeds. That risk is greater where a mix already contains a starter charge, cells dry unevenly or water fails to drain. A white mark on the surface or damaged leaf tips cannot confirm the cause on their own. Write down what you applied and how often. Check a root ball from an affected cell. If the problem persists, identify the mix and water or seek a diagnosis before switching to another concentrate. ## How to make the first application when it is needed - Select seedlings at the same stage, grown in the same mix and under the same care. Check for active growth and suitable moisture inside their plugs. - Find the seedling group and your method in the product directions. Identify which unit measures concentrate and which measures the water. - Use a clean container and measure accurately. Estimate the amount of mixed solution those cells will actually use and follow the ratio for that specific product. - After applying, keep checking moisture and new leaves. Mark the date on the tray so you do not repeat the application on the next plain watering by mistake. Before shopping, estimate how many plugs you intend to feed rather than starting with the capacity of the watering can. A tray, a larger container and a garden bed have different root volumes and application methods. If you are working with several vegetables, label each prepared container and check the relevant crop group in the instructions. After planting out, reassess the cabbage under field conditions. Refer to [feeding cabbage as the head develops](https://dunger.ua/en/blog/cabbage-feeding-and-head-formation) for that later stage. Sometimes it is enough to even out the watering and watch for the next leaf before deciding on a feed. Mark the cells where the problem started and see whether the improvement reaches the entire group. If you are planning another sowing, compare [growing media for seedlings](https://dunger.ua/en/blog/seedling-growing-media) first. If you grow Chinese cabbage as well, see growing Chinese cabbage outdoors for the distinct outdoor decisions for that crop. ## A liquid seedling feed when the mix needs supplementing [](https://dunger.ua/en/mineral-fertilizers/small-packaging/for-garden-crops/17-complex-fertilizer-for-hydroponics-and-soil) ### [COMPLEX FERTILIZER FOR HYDROPONICS AND SOIL](https://dunger.ua/en/mineral-fertilizers/small-packaging/for-garden-crops/17-complex-fertilizer-for-hydroponics-and-soil) If the seedlings are actively growing, the mix lacks sufficient starter nutrition and moisture and light are suitable, consider this liquid DÜNGER fertilizer. Its full directions include all types of seedlings. For a tray with growing mix, check the root-feeding directions and account for any feed already scheduled before making another application. It is used during the whole period of plant development and growth. When root feeding in soil / substrate, dilute 20 ml (1 cap) in 2 liters of water, use with every third or fourth watering. When processing (spraying) on a leaf - to dissolve 2 ml in 2 l of water, and to carry out processing 2-3 times. The bottle contains 0.5 L of concentrate. Check the composition, full directions and current ordering options before buying. The working solution required for a small tray depends on which cells need it and the moisture already present. [Plan your growing area in My Garden](https://dunger.ua/en/my-garden) ## Frequently asked questions ### In a mix with no added nutrition, check the seedlings after the cotyledons have opened and read the directions for the mix and product. If the mix contains fertilizer and the plants are growing evenly, observe them first. Check light and moisture as well. ### ### ## Rate this article No ratings yet. Be the first! Rate this article ## Discussion(0) This discussion is shared across all article languages. Loading… Share this article ## Related Posts  [Vegetables and greenhouse](https://dunger.ua/en/blog/categories/vegetables-and-greenhouse) ### First feed for outdoor tomatoes: what to check after transplanting Compare new growth, moisture in the original plug and how the bed was prepared before deciding whether to wait, water or feed. 2026-11-09 • 7  [Vegetables and greenhouse](https://dunger.ua/en/blog/categories/vegetables-and-greenhouse) ### When to sow spinach outdoors Choose a cool spell, sow spinach in short rows and recognize the start of bolting. 2026-11-09 • 7  [Vegetables and greenhouse](https://dunger.ua/en/blog/categories/vegetables-and-greenhouse) ### When to sow cucumbers for transplanting Work back from a warm planting bed. Choose a pot, harden off your cucumber seedlings and transplant them with their roots intact. 2026-11-09 • 7 Order & Inquiry ## Get in touch  Order mineral and organo-mineral fertilizers directly from the manufacturer. 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