These are my plumi seedlings. The smallest are only about one and a half week old. The biggest ones are olmost up for a repotting. What size of pot in cm should I use for them?

I would wait for at least four true leaves, and then step them up into 6" pots.

Yes I will wait for the second pair of leaves, but what is 6" in cm . I have no idea as we do not use inches here. They are doing so nicely now. I would not like to harm them.

this may come in handy:
http://www.metric-conversions....

Thanks @Dutchlady1. 6" is 15 cm. I think will will go buy some pots this week. So I have them when they are ready to repot.

I have to convert a lot so I just use 1 inch = 2.5 CM (not exact, but close enuff) and easy to remember.

As an Engineer wish the heck we had changed back in the 1970s when it was seriously discussed. Except for gal -->liter. I do NOT want to think of how expensive gasoline is in liters. Nor how fast the the meter spins on the gas pump in liters.

I can imagine that. I am just glad we work with cm and liters here in Holland.

I wish everything was the same across the board.

Here's a thought. Let the rest of the world use inches and gallons.

It sure would be nice if everything was the Same all over. There is a good thought @drdawg

Adeniumgirl said:

These are my plumi seedlings. The smallest are only about one and a half week old. The biggest ones are olmost up for a repotting. What size of pot in cm should I use for them?

Just looked at that again. Are you providing extra light? Those plants in the left most container are getting quite leggy.

No extra light.. I already had the feeling they where getting a bit to tall. Should they need some light than? So that they will grow a bit more compact.

Well - it is too late to make them compact - the ones that are quite leggy. One thing to help prevent legginess to a degree is to add a fan blowing over the seeds. Running a fan provides many other benefits as well, but studies have shown that it helps to make stems stronger and that helps prevent legginess.

If you can somehow add some light, do so.

Also, rotate your seed tray every few days.

Perhaps it is also better to remove the lid from the propagator so they get more fresh air. I guess being in a closed propagator is also making them leggy.

When I use a plastic cover on my seedling trays, I remove it for a few hours daily and remove completely once I have solid germination. If I use one. But these days I seldom use a cover. Do you have a picture of your propagator?

I don't cover any of my germinating seeds any longer either. I should throw those domes away. They just take up valuable space.

My fans run 24 hrs. in the greenhouses (one in each greenhouse). During the daylight hours, two fans run in each greenhouse and I have the same set-up in the solarium as well. I just installed a "dually" fan and I love it. I ordered a second one yesterday and that's what I will use in the solarium. They are quieter than the 20" box fan and having two fans per unit allows me to direct the air-movement in two directions. Neat fans.

At this moment I do not have a picture. It is one with bottom heat with a thermostate. The lid does have slides in it. Witch I already did open during the day. I did now take it of, and for the night I will put it back till the morning. Hope that is better. After all during the night the temp can droge now in winter.

about more light and not covering them. It will also allow the soil to get drier and prevent mold.

Adeniumgirl said:I can imagine that. I am just glad we work with cm and liters here in Holland.

Holland has many redeeming values. A beautiful country with wonderful people and fantastic bulbs. Had the please to work/visit/honeymoon in Amsterdam.

Adeniumgirl said:Perhaps it is also better to remove the lid from the propagator so they get more fresh air. I guess being in a closed propagator is also making them leggy.

The primary causes of legginess are both light related. Not enough or seedlings reaching for the light.

I use older technology fluorescent lights that put out virtually no heat. I lower them so that they are sitting only a few centimeters above the plants. As the plants grow, I raise the chains still keeping them very close.