They are not the same if you are referring to a kumquat and a calamondin. They are quite different.

Calamondin, I believe is a hybrid (kumquat x mandarin). The marumi is not a hybrid but a true Fortunella (just with round fruits; not oblong).

Any true nursery will sell marumi as kumquats and calamondin as calamondins. This uis on time that buying from a real nursery is important and not from a box store or cutesy Internet sales shop.

Steve

I think you are giving box stores a bad rep. In California Home Depot and Lowe’s sell four winds citrus they are a very reputable seller. Here in north georgia Lowe’s carries record buck farms. I think the main problem with a box store is sometimes the employee puts the wrong Lowe’s tag on the citrus. this is why it’s important to check the wholesaler sticker on the pot or the wholesalers tiny tag to confirm the actual varieties

melikeeatplants; Meliketoeatplants too. The addition of "to" is intentional. Our Vegan potluck is every 3rd monthly Sunday at 2:00 PM

That is not the case here in Cincinnati. What you have said is to buy accurately from big-boxs, one must know how to read between the labels. You don't have to when you deal with a reputable dealer, but can alway get great big-box products when you read between the labels.

Steve

Thank everyone for your opinions. I am just confused about why some sources said "Marumi Kumquat (Calamondin)". Those knowledge poisonous sources mislead many people.

Has any one really bit a piece from a true Marumi kumquat? May you give me a detailed description about its taste?

melikeeatplants, what did you mean by saying much better? How better were they compared to each other? Sweeter? More fragrance? Bitter? Sour?

Much better? For me if the Maumi is good on Flying dragon Then It is much better because I can plant one in the south cumminsville community garden and it will survive in an unheated enclose similar to what I am using for my outside heat

Poncirusguy, he meant to talk about the fruit taste. Probably he was right about the taste of Meiwa compared to Marumi, but I just still wonder how better they were?

By he way I just did some quick searchs on internet and found that FD rootstock does help to harden the scionwood to increase hardiness by a few degrees but due to its slow growth (non-vigorous), it will take longer to recover if was damaged by freezing.

Secondly, the Poncirus is not hardy enough to survive a 0F without going dormant, but none of Citrus Hybrid inherited the dormant gene from Poncirus. I mean if we can retain the dormant ability of the Poncirus in our hybrid citrus, I bet for sure they will easily survive down to zone 5 with no protection.

While I realize me is talking taste, for anyone in zone 8a will need to be very careful that the right cold hardy rootstock was used. 8a and colder planting outside with out protection is now limited to the Marumi kumquat on FD, PT, or own roots.

Steve

meiwa was sweetest but fukushu was overall the best because it’s a lot bigger and juicier and a nice sweet/tart combination almost like mixing a nagami with a meiwa.

PT/FD vs Non PT/FD

No leaves on PT. They turned colors and fell

No leaf loss on US897 Just now brought in for picture taking then back outside. The tree has seen teens and low 20's many nights with no damage.

poncirusguy, it is better to lose leaves and go dormant to endure greater cold. I don't know why none of the citrus hybrid carry the gene of dormancy from Poncirus Trifoliata. Is there anyway to carry the dormancy gene from Poncirus on to our hybrid citrus?

I read a few articles about the effect of Poncirus rootstocks on scion woods and came up with a conclusion that rootstock does go dormant make the scion wood dryer than normal which help to slightly withstand colder climate; however, they did not mention whether or not the leaves on scion wood would retain or fall off.

The leaves on scion wood grafted to PT/FD remain on the tree unless the temperature goes below the leaves tolerance, then they drop. There can be a 5-10 F difference between leaf drop and dead wood. Fruit that doesn't ripen in time falls of the tree when it PT/FD root shut down.

I agree that it is better to loose deciduous leave to a dormant tree than hold onto the leave becaue the tree will not go dormant.

Steve

Poncirus will start to drop leaves at 50F and go to predormant stage but Hybrid do not. Citrus Hybrid retained leaves which means they don't have the dormant gene of a deciduous tree. I will graft back a few branches of FD to scion wood hopefully these FD scion wood will command the whole tree to go dormant like a true deciduous tree.

By common sense, we can't say that the leaves of hybrid citrus is more cold tolerent than leaves of Poncirus, but the fact is that leaves of Poncirus would fall much sooner than leaves of hybrid citrus. I guess citrus hybrid missed an important gene that signal the tree to go dormant as a true deciduous tree.

The twigs branches and trunks are much cold hardier. PT/FD -25F, (US852 0.0F) 25 F difference