How Much Light is Best For Tomato Seedlings?

How much light should tomato seedlings get? If you give them too little, they will become tall, skinny, unhealthy plants, a condition called leggy. If you give them too much the leaves will be damaged. How much is the best amount?

The new science of growing tomato seedlings will surprise you.

12 tomato seedlings with several red tomatoes in front.
Tomatoes and tomato seedlings, source: Depositphotos
  • Tomato seedlings grow best with a PPFD of 250 to 300.
  • A DLI of 10 to 13 works best.
  • All plant seedlings need 8 hours of darkness.

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Should You Use Drainage in Your Pots?

It used to be very common to add drainage material, such as rocks, Leca, or clay pot shards in the bottom of pots for added drainage. Then it was claimed that this is a myth and it does not work. But then some new science this year upsets everything by showing drainage material may actually work.

Should a gardener use drainage material? What kind of material works best?

lady's hand putting leca beads into a pot.
Leca being added to the bottom of a pot of succulents, source: Depositphotos
  • Drainage material reduces the water in the soil.
  • It is best not to use drainage material in most cases, but it can be useful in the right situation.

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Does Gravel in Pots Increase Drainage – The Latest Science

Logic would have you believe that adding gravel or pot shards in the bottom of a pot or container will increase drainage and this has been a common practice for a long time. More recently some gardening experts and scientists have declared this to be a myth, claiming that gravel does not increase drainage when placed in the bottom of a pot. That is the current thinking.

New science has now been published that debunks the claimed myth and concludes that drainage material in the bottom of a pot or container does increase drainage.

Does Gravel in Pots and Containers Increase Drainage?
Does Gravel in Pots and Containers Increase Drainage? source: North Dakota State University
  • New science shows that drainage material in the bottom of a pot increases drainage.
  • Highly porous soils are affected more.
  • Sand at 60 mm worked best.

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What is DLI – the Daily Light Integral 

In the good old days, it was easier for gardeners to talk about the artificial light plants required because most gardeners used fluorescent bulbs and most manufacturers produced about the same quality of bulbs. We could easily say that, for example, African violets should be grown 6 inches below a two-bulb fixture, and that would … Read More

Biochar – Does it Really Work in the Garden?

Biochar is a special kind of charcoal that seems to have many benefits as a soil amendment. It holds water, acts like a fertilizer and grows bigger plants. While doing all this it is also eco-friendly and sequesters carbon in the soil for many thousands of years. Sounds like a win-win-win.

What is biochar? Are the claimed benefits real? Should gardeners be using this product to amend their soil? Let’s check it out.

Different samples of Biochar, photo from UC Davis Biochar Database
Different samples of Biochar, photo from UC Davis Biochar Database

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Pros & Cons of Hydroponics, Aeroponics, Kratky, Aerogardens

Hydroponics is becoming much more popular with home gardeners and there are a number of different systems including regular hydroponics, aeroponics, kratky hydroponics and indoor hydroponic gardens such as AeroGardens and LetPot. This post will examine the differences between these systems and provide a pros and cons list for each one. Armed with this information you will be able to select the right one for your situation.

girls slicing tomatoes beside a counter hydroponic system
The LetPot aerogarden hydroponic system

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18 LED Grow Light Myths You Should Know About

LED Grow Lights are becoming very popular and they are a good choice if you are buying a new grow light system or upgrading your old florescent fixture. This post about LED grow light myths will save you time and money.

As with any new technology there are many myths about LED grow lights. Some are started because of a lack of knowledge by the general public, but many are started by manufacturers who are trying to sell their product. Some of them prefer to keep us in the dark so they can make outrageous claims, but the better companies don’t do this. We need to do our part and become educated consumers so that we can properly evaluate both the message being broadcast and the product itself.

Don’t go shopping for LED grow lights until you read all of this post.

LED grow light myths, showing a red and blue LED
LED grow light myths, showing a red and blue LED

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Does Planting With The Moon Work?

The idea that the Moon affects plant growth is an old one that is believed for many moons. It can be found in the folklore of ancient societies ranging from the Celts in Britain to the Maoris in New Zealand. Roman historian, Pliny the Elder, in his History of Nature, Book 18, gives much advice on planting by the moon phases. Today, it is still a rural tradition and in most countries you can buy moon gardening calendars.

The lunar experts suggest that you pick fruit at the full moon for the market as it will weigh more and pick at the new moon for personal consumption because the fruit stores better. Seeds also germinate faster when planted under the right phase of the moon.

A picture was posted recently in a Facebook Group showing a Planting by the Moon calendar on sale. I made a comment about being surprised people still believe in such things. That was a big mistake. Dozens of people jumped on me for not being a believer. How dare I say anything derogatory about what granny believed. Not one person came to my defense. The belief in planting by moon phases is still very common.

Planting by the moon phases
Planting with the moon phases

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What’s New in LED Grow Lights

LED Grow lights have come a long way in the last 5 years and there are some great new designs and changes that make these lights even more attractive to home gardeners. In this review I will have a look at some very important innovations and price changes that make LED grow lights an even better choice.

What's New in LED Grow Lights for 2022
What’s New in LED Grow Lights for 2023, source: Sylvane

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What is Salt – It May Not be What You Think

Some people won’t use synthetic fertilizer because it contains “salts”. For years I was told not to use mushroom compost because it contains “too many salts”. Salt is also recommended to kill weeds and just today I saw a post which suggested pink Himalayan salt makes plants grow better. You can buy commercial sea salt to fertilize your plants. This doesn’t make sense. Salt is a weed killer and it’s a good fertilizer?

As a gardener it is crucial that you understand which salt is being discussed so you don’t use the wrong one and harm your plants. This blog will help you through the maze of salt crystals.

Picture showing salt shaker and a bag with NPK on the label, and the word VS between the two
What is Salt?

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Best Way to Water Indoor Plants

Watering indoor plants seems to be one of the most complicated things for new gardeners to learn, which is surprising since it’s really simple. The problem is that a lot of the information out there makes the subject complicated and it gives new gardeners bad advice.

In this post I am going to give you some simple rules that work for any houseplant and makes watering easy. I’ll help you decide when to water and show you the best way to do it.

Girls water houseplant
Watering Indoor Plants – Watering Houseplants

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