Growing Nero Toscana Kale in Kratky Hydroponics – Update: Week 1

It’s been one week since I planted my kale seeds in my Kratky hydroponic container, and its time to see how they have grown! The variety is Nero Toscana.

Nero Toscana Kale, Image Courtesy of Botanical Interets
Nero Toscana Kale, Image Courtesy of Botanical Interets

Please excuse the dusty lid; whilst my plants are growing inside, we still get quite a lot of dust from dust storms, and just general air. I also noticed that my paint hadn’t fully cured and was slightly sticky, thus catching all those little dust particles.

Kale Grown In Kratky Container, Week 1
Kale Grown In Kratky Container, Week 1

4 out of 5 of my Nero Toscana kale plants sprouted, and have grown enough to remove the little grow dome (salvaged from some used Aerogarden Bounty pods).

Kale Grown In Kratky Container, Week 1
Kale Grown In Kratky Container, Week 1

One net cup did not sprout anything at all, even though I planted three seeds in each cup. In itself I would consider this just bad luck, but in the Swiss Chard bucket beside this one the same outer cup didn’t grow there either.

Kale Grown In Kratky Container, Week 1
Kale Grown In Kratky Container, Week 1

The rock wool medium is wet, so the seed should be getting enough moisture to germinate. Perhaps there is too little light reaching these outer cups? I have switched the outer cup with an inner cup in the hopes that it gets the light needed for a slightly later blooming, but so far nothing.

Do you have any idea why just one cup might not germinate? Please share your ideas in the comments below.

Seed Germination Temperatures

A bit over a week ago I planted some spinach seeds, and sadly they didn’t germinate. I began a bit of research as to why. Despite my spinach varieties being hardy to warm weather, they still need cooler soil to germinate! The adult growth stage can handle warmer temperatures but the seedlings are too vulnerable still.

I began to wonder what I could grow with my current temperatures. It’ll also be handy to know the minimum temperatures for when the seasons change.

Whilst my plants aren’t being planted in soil, instead hydroponic is usually planted in rock wool or peat moss, the germination temperature should theoretically remain the same.

Optimal °FOptimal °C
Amaranth, Red Leaf68-7520-24
Basil, Purple Petra65–8518-30
Basil, Genovese70 – 9021 – 32
Broccoli45 -85 7-29
Cilantro55-7013-21
Cucumber, Lemon70–9021-32
Kale, Nero Toscana 65–8518-30
Lettuce, Little Gem (Romaine)40-755 – 24
Lettuce, New Red Fire60–7016-21
Lettuce, Red Sails60–7016-21
Lettuce, Red Salad Bowl50-7210-22
Pepper, Cayenne65-9518-35
Pepper, Jalapeño 65-9518-35
Spinach, Matador50–7510-24
Spinach, Lavewa50–7510-24
Spring Onion68-7720-25
Swiss Chard, Bright Lights75–9024-32
Swiss Chard, Lyon50 – 7510 – 24
Taisai, Pak Choy50- 8010 – 27
Tomato, Marmande VR60 – 7015 – 20
Tomato (Cherry), Supersweet 100 FT75 -9021-32
Tomato, Sam Marzano70–9021-32

I measured my Aerogarden water and it’s hitting a maximum of 85°F (30°C)! No wonder my spinach never sprouted, its ideal temperature is 50-75°F (10-24°C). Its just way too hot for them.

I’ll have to wait a while for the weather to get a bit cooler before I can sprout spinach; in the meantime I can try growing some Bright Lights Swiss Chard and Nero Toscana Kale.