Learn Dutch: De pot is te nat voor de plant. - The pot is too wet for the plant.

The verb blijven (to stay or remain) is used to emphasize that a state or action continues over time. This sentence is just stating a simple fact about the current condition of the pot using is (is). If you wanted to say 'The pot stays too wet', you would say De pot blijft te nat.

Does te mean 'too' as in 'excessively' or 'also'?

Here, te means 'too' in the sense of 'excessively' (te nat = too wet). If you wanted to say 'also', you would use the Dutch word ook.

Is pot just a regular plant pot here?

Yes, in this context it refers to a flowerpot (often specifically called a bloempot). The Dutch word pot is also commonly used for a glass jar or a cooking pot, but it does not have the English slang meaning for marijuana.

Why is nat spelled with only one 'a'?

It follows the Dutch spelling rules for short vowels. Because the 'a' in nat has a short sound, it is written with a single 'a' inside a closed syllable (a syllable ending in a consonant).