Good morning, all.
I am trying to find time to reread everything, but I did not get there yet, as yesterday was way too busy (but hopefully this week.)
SOLO CUPS:
I will explain my strategy with the big pots in a moment, but please let me start with the Solo cups, because it is much simpler.
On Saturday the tops of the cups looked too dry in the morning (before the sun hits the plants), so I sprayed two squirts of water around the rim of the top half of the cup, for the spreader roots.
Well, I don't know if you can tell from the photo, but this morning the soil still looked a little "pre-dawn moist" when I went up, so I don't think to water the tops yet.
(Is that wrong?)
I don't know how well you can see through the plastic cups, but when I inspect the sides, the bottom half looks a little darker (wetter) than the soil in the top half of the cup.
(And is that why it seems like the roots have not grown much the last few days, is that they still have some moisture, so they don't need to make any effort???
LAZY little girls!!!)
These photos are fairly indicative, so I will only post a few. I don't know if you can see, but the bottom half of the cup is darker (wetter) than the top.
So now I am trying to figure out exactly how long to wait until watering to runoff again.
Do I wait until the little girls juuuust barely start to wilt?
Or is that waiting juuuust a little bit too long?
(Or how do you know when to water to runoff again?)
Also, how long do I leave the seedlings on heat mats in an outdoor grow where the daily high temps are maybe around 70-72 F, and the daily lows are around 50F?
Do I just leave them on heat mats permanently in that kind of an environment?
(I have enough heat mats, if that makes a difference.)
BIG POTS WITH HOMEMADE SOIL:
The big pots are harder to explain.
Since I started directly with a seed in a big pot, I am trying to figure out the best strategy to follow, to maximize root growth, given the situation.
Three of the big pots have a homemade soil that
@Azimuth and
@SmokingWings helped me to make.
It seems like pretty good soil, but it does not hold moisture.
I was not getting moisture down to the base of the pots (at all) and the tops of the pots were also fairly dry (because it seems like that soil dries out really fast).
So I toked on it, and decided to take a gamble.
The center mass was moist, so I decided to water down the sides of the pot until the bottom of the pot was wet (for the first time) which effectively kind of soaked the whole pot.
Now I plan to keep watering the rim of the pots, and keep the bottom 1" of the pots moist as the top and center dry out again. I will also try to keep the spreader roots moist by watering every 2-3 days (and it is so helpful to have a water meter!)
I am a little concerned that watering the pot that early might be suicide, but since the soil dries out so fast, I am hoping that the little girls will have to keep reaching for the rims and the base of the pots if they want anything to drink.
I would not try that, except for how fast this soil seems to dry out.
I will keep you posted as they dry out.
SINGLE BIG POT WITH BAGGED BOUTIQUE SOIL:
There is also one single big pot with the boutique bagged soil, and I think it is the most confusing, but I am taking basically the same strategy (i.e., taking the same gamble) with some modifications.
The center and bottom of that pot were already moist, so I only watered the rim, so that the pot is now basically uniformly damp.
Now I will apply water only at the rim, and also give it a lot less water, so as not to add to the moisture at the bottom of the pot. But again, the plan is that the girls will slowly have to send out new roots for their water.
I hope that was the right thing to do. I guess time will tell.
BIG POT QUESTIONS:
In addition to the questions above about heat mats, and knowing exactly when to re-water the Solo cups until runoff, I guess I wonder why I never had "small seedling in big pot" syndrome before, when I used to grow indoors, under LED lights. Was it that the indoor environment was a lot warmer (usually maybe 78F or so in the day, and 66F or so at night)?
Was it that the lights shining on the soil caused more evaporation?
Because I never had a stunted seedling when growing indoors, and I always planted directly in a 5g or 7g soft pot.
(I am sure the roots were not nearly as developed as they will be with
@Emilya 's up-potting routine, but I never had a stunted one...)
Also, I took it from the previous discussion that the reason the plants generate roots is that they run out of water, and must send out new roots, to try to find some (or as
@Azimuth put it, they are "trying to get their fix").
So, how dry is the point that the seedlings send out more roots?
(And do I wait until they almost wilt? Or when do I give more water?)
Thank you all very much.
This is like the best forum ever.