Can you start seeds in soil with fertilizer?

Author: Dr. Stevie Fahey  |  Last update: Friday, February 21, 2025

Although some seed starting mixes have fertilizers in them, fertilizers are not necessary for seed germinating. Wait until after the seed germinates and mix up a light formula of soluble fertilizer with water to add important nutrients to your young plants.

Can you germinate seeds with fertilizer?

Fertilizer has no effect on seed germination if used in small amounts, but can negatively affect seed germination if you use too much fertilizer. What is this? Since seeds require no external sources of nutrition to germinate, it's not recommended to apply fertilizer to seeds. In fact, it can reduce germination rates.

Can you plant seed and fertilizer at the same time?

However, it's generally best to fertilize separately from overseeding. Applying fertilizer and new grass seeds at the same time can lead to problems such as: Competition for nutrients: When seeding and fertilizing simultaneously, the existing grass will compete with the seeds for the available nutrients.

Should you fertilize soil before seeding?

Always follow guidelines for the best time to plant grass seed for your region and grass type, then fertilize accordingly. For seed or plugs, apply fertilizer with a regular lawn spreader before you plant. If you're starting a lawn with sod, fertilize after your sod is in place.

What kind of soil should I use to start seeds?

Choose a seedstarting mix that's made for germinating seeds. Do not use soil from your garden or re-use potting soil from your houseplants. Start with a fresh, sterile mix that will ensure healthy, disease-free seedlings. Before filling your containers, use a bucket or tub to moisten the planting mix.

When To Feed Seedlings - Garden Quickie Episode 126

What is the best mix for starting seeds?

Combine compost, topsoil, a bit of coarse sand, and something like vermiculite, perlite, or coco coir until you have a mix with a consistency that holds together when wet. For seed starting, you'll avoid using as much sand as you would when making soil for your garden.

Can I plant seeds directly in soil?

Planting seeds this way is called direct sowing, and it is an easy process that yields great results. Unlike indoor seed starting, direct sowing involves unpredictable elements: weather, wildlife and insects. Even so, many vegetables, annuals, herbs and perennials sprout easily from seed sown directly into garden soil.

Should I fertilize when planting seeds?

When a seed sprouts, the first set of leaves that unfold are called cotyledons. All the nutrients that are needed to sustain these cotyledons are contained right inside the seed. But once the second set of "true" leaves appear, you should begin feeding your seedlings with a dilute fertilizer solution.

Should I put topsoil down before seed?

Adding topsoil to your lawn before planting grass seeds is a good approach, as long as you amend and aerate it before seed dispersal. After laying your topsoil, work around 4 inches of organic material into it to create a fertile soil environment.

Is 10-10-10 a good starter fertilizer?

10-10-10 fertilizer is a balanced, all-purpose fertilizer containing equal parts of nitrogen, phosphorus, and potassium. It's often used as a starter fertilizer for new lawns and is also suitable for established lawns.

Can you put fertilizer on top of seeds?

While it might be tempting to fertilize your lawn right after sowing new seeds, it's wise to keep these two tasks separate. Seeds and young sprouts are much more fragile compared to fully established turf, and fertilizer treatments could be too strong for their delicate growth.

Can you seed right after fertilizing?

You can plant grass seed immediately after applying fertilizer. Please make sure there is no weed preventer in the fertilizer, as this will also prevent the grass seed from germinating.

Can I put topsoil over fertilizer?

It's optional, but yes, you can fertilize before topdressing a lawn. If you decide to aerate, the fertilizer should be put down after you aerate and before you place the topdressing material.

Do seeds need to be covered with soil to germinate?

As a rule of thumb, bury seeds only about as deep as their diameter. Sprinkle fine soil on top of the seeds, pressing them gently to ensure they have contact with the soil. A flat piece of wood is ideal for this job. Some seeds, such as lettuce and dill, need light to sprout, so cover these types sparingly.

Which fertilizer is best for seed germination?

Using liquid seaweed biological fertiliser is excellent for rapid seed germination, due to its own natural growth hormones such as auxins, cytokinins, and gibberellins. These hormones play a crucial role in stimulating cell division, elongation, and differentiation in plants, leading to faster and healthier growth.

How long does fertilizer last in soil?

Fertilizers for flowers will last in the soil for 2 to 4 weeks but depends on above mentioned conditions. The type of fertilizer you use will determine how long it takes for it to work in the grass. A little but continuous amount of nutrients are delivered over a 6 to 8 week period using slow-release fertilizers.

Do you put fertilizer down before seed?

You want to fertilize new lawns six to eight weeks before laying seed. The type of grass will determine when you want to lay fertilizer and seed. For example, cool-season grasses are sown during the fall, so you should put down fertilizer in late summer or early fall.

Should you pack down soil when planting seeds?

DO tamp down the soil into your containers or cell packs. Then pack it down a teeny bit more.

Can I just throw grass seed on bare spots?

Very Small Patchy Areas: For tiny bare spots (think a few inches in diameter), throwing a small amount of seed and keeping the area moist might suffice. However, even in these cases, lightly raking the soil to create some seed-to-soil contact can significantly improve results.

Do seeds germinate faster if fertilizer is applied?

Seeds don't necessarily germinate faster with fertilizer, although it's quite usual to find seed starter mixes combined with them. For best and safer results, it's better to wait until seeds germinate before applying fertilizer so as not to shock and stress them out.

What comes first seed or fertilizer?

It's best to fertilize right after aerating and seeding, allowing the fertilizer to sink into the aeration holes ensuring deeper soil penetration. Proper fertilization encourages a lush, green, healthy lawn that stands out and offers a beautiful outdoor space for relaxation and play.

How often should I water seed starters?

Seedlings should be watered between twice a day to every two days depending on how fast the soil dries out and how much water the seedlings absorb. There is no hard-and-fast rule about watering frequency; instead, learn how to check when seedlings need watering.

Should I fertilize soil before planting seeds?

You can broadcast dry fertilizer (1 pound for each 100 square feet of garden or 100 feet of row) over the entire garden plot before planting. Then after planting, side-dress along the plant rows. The fertilizer should be applied 2–3 inches to the side of, and 1–2 inches below, the seed level or plant row.

Can you just throw seeds on the ground?

Wildflower seeds don't need to be planted in holes; however, they should be tapped down to encourage growth. After you've scattered them over the soil, use the back of a shovel, your hand, or your foot to gently press them into the ground.

Can I start seeds in regular soil?

Soil microbiology can be very good, but it can also include pathogens that will kill your seedlings right as they're germinating. So soilless mix is the way to go when starting seeds. An 8-quart bag of soilless mix will run you between $7 and $12, and that will fill two 10-by-20-inch seed trays.

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