Black Cosmos are annoying this time around:
Red + Yellow = Orange (100%)
Orange + Orange = Black, but the odds are different: Some Pairs have a 6.25% chance, but some pairs have a lower chance at under 4.7%.
Increasing the chance is difficult - you can try making more orange cosmos from the original oranges, but some made that way don't have a chance of giving black ones at all. Telling the good orange from the bad are next to impossible, too.
Orange Tulips, though, have a more fixed shot at giving Purple ones - always 6.25% or higher - and new Oranges you get from them may have a much better chance.
I'd switch the black cosmos and purple tulip on the tier chart. The orange cosmos is guaranteed with a seed red and seed yellow and two orange cosmos will give you another orange 50% of the time, half of which will have superior genes. So you can quickly build up a large orange cosmos batch and give yourself a lot of chances at the black cosmos. On the other hand, the orange tulip is only a 50% chance from a seed red and seed yellow and breeding two orange tulips together will give you another orange only 37.5% of the time and only a third of those will have superior genes. This is because 12.5% of the offspring between two regular orange tulips will be island black tulips which are really good but unfortunately are indistinguishable from regular black tulips which have no chance of producing a purple tulip. The black cosmos is statistically much easier to acquire, but the method is more sensitive to contamination than than the purple tulip method.
I've been made aware that what I wrote above isn't always true.
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