Questions tagged [seedlings]

Small juvenile plants which have just germinated.

Technically, a is a young plant sporophyte that has developed from a plant embryo (which is contained in a seed).

A seedling will have an embryonic root, embryonic shoot and seed leaves. The seed leaves are different than adult leaves, and are usually a lot smaller and often a different shape. Plants are often classified by the number of seed leaves. Angiosperms (flowering plants) have one or two seed leaves. Monocots have only one pointed leaf, and include the grasses. Dicots have two (usually rounded) seed leaves. Gymnosperms can have more variation, for example pine seedlings have 8 seed leaves.

Use this tag for questions about caring for seedlings and any problems encountered. Seedlings are typically very delicate. They are susceptible to damping-off which is fungal mould problem that kills seedlings before any adult leaves can form.

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Do these sunflower seedlings need to be thinned?

I have two questions regarding the sunflower seedlings in the picture below. I think my sunflowers are too close together. How much should I thin them and based on their height, does now seem like a good time or should I wait? Some of them have…
amol
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How soon can I start training or pruning a seedling?

Is there a minimum age, height, or trunk girth before I can start training or pruning a seedling / young tree? I am concerned that starting too early would be detrimental to its early growth. Specifically, I have a wax apple tree that is just 8''…
JoJo
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My shady and rather cool garden is always behind those nearby. Could starting seedlings under grow lights help?

I grow veg in southern England, starting from seed in a south-east-facing windowsill. I already use a heated propagator for my seeds as my house isn't very warm in early spring. The garden has mature oak trees and a hedgerow along the south east…
Chris H
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How should I care for a potted apple seedling?

About two weeks ago, a friend of mine ate an apple and found that the seeds had already sprouted inside the apple. I thought this was pretty cool, so I put them in a cup to grow. They grew into "real" seedlings, so when I went home for spring…
Throsby
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How bad is it to use colour newsprint for paper pots?

Discussions here and here talk about making these frugal paper pots to ease the shock when transplanting seedlings. I've heard though that you should only use black and white newsprint, as the colour ink may contain heavy metals. But with the rise…
AvieRose
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Yellow spots on my tomato seedlings

Would anyone happen to know what these tiny yellowish dots are on my tomato seedlings. They are about a month old, the seedlings. I've just noticed the spots after a deep watering. I've checked for bugs and stuff. I didn't find any. I keep a fan on…
JT Nwor
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Why are my Zinnia seedlings dying?

It is a seedling of Zinnia elegans Super Yoga. The cotyledons have dried out and I have no idea why. Potentially relevant information: The soil media is an equal mix of compost, river silt and coco coir. I planted around 12 seeds of which only two…
Abc
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Why are my Freesias sprouting in the fall?

I bought some Freesias in the spring last year and planted them in a wooden planter. All spring and summer, I didn't see any signs of life, even though they got watered regularly. Then in the fall of last year, they started to grow. They stayed…
Niall C.
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What are these black spots on white splotches appearing on my tomato seedling?

Here are pictures of the infected leaves. I cut them off the plant as soon as I saw them today. Click for full size Here are close-ups of the most infected leaf: Click for full size What can I do to prevent this from happening to the rest of the…
Om Patange
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Are my poppy seedlings dying? How can I save them?

Are my poppy seedlings dying? I leave the plate filled with water everyday. How can I save them? (Even if it means ripping some off and leaving them more spaced out.)
Azzine
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How to retrofit seed starting trays to prevent root circling

I grow plum trees from pits using seed starting trays: Unfortunately, I have a problem where the roots of the seedlings grow in circles around the bottom of the cavities of the trays. The circling roots cause problems when the trees grow to…
User1974
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Why are my snack peppers wilting?

Snack Peppers; I love these things, the kids eat them right in the garden while we work there. The seeds are harder to find than most peppers in local stores, and I refuse to pay $3.50 for a single growing plant at Lowes, etc and I want to grow my…
Greg
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Does anyone know what these seedlings are?

This is an acorn that I've found in abundance is Rockford, Illinois, USA. I think it may be a red or black oak but I'm not sure. It has a very distinct look with the line showing separating the two halves. [![enter image description…
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What plant will grow from these seeds?

Last month, I found in my kitchen a bag of chia seeds intended for human consumption, but the expiration date was in 2017. Instead of throwing them away, I sprinkled some in several cells of my seedling tray, and, guess what, some started growing. I…
VividD
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What is this giant seedling?

I set up an experimental seed starting tray, but can' remember exactly what seed I put for some seedlings. One of them is a HUGE seedlings pictured in photos below. I just vaguely remember that it could be an Agastache, or so some form of…
VividD
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