| | Plattdeutscher Name | Deutscher Name | Englischer Name | Botanischer Name | | Irwelen (Westfalen) | Erdbeere, Wald- | Strawberry, Alpine | Fragaria vesca |
| Isaak (Vierlande/Hamburg) | Johanniskraut, Tuepfel- | St. Johnīs Wort | Hypericum perforatum |
| Isenhood (Delmenhorst) | Eisenhut, Blauer | Friarīs Cap | Aconitum napellus |
| Isern Ber (Suesel/Ostholstein) | Birnbaum, Garten- | Pear, Common | Pyrus communis |
| Isgewaechs (Westrup/Westfalen) | Mistel, Laubholz- | Mistletoe | Viscum album |
| Iwer (Nordfriesland) | Vogelmiere + Sternmiere, Vogel- | Chickweed, Common | Stellaria media |
| Jackhaelse (Westfalen) | Eisenhut, Blauer | Friarīs Cap | Aconitum napellus |
| Jacobsleller | Himmelsleiter, Blaue | Jacob`s Ladder | Polemonium caeruleum |
| Jadde (Ostfriesland) | Spergel, Acker- + Spark, Acker- | Spurrey, Corn | Spergula arvensis |
| Jaduewel (Probstei/Ostholstein) | Johanniskraut, Tuepfel- | St. Johnīs Wort | Hypericum perforatum |
| Jaegerkruut | Baerlapp, Keulen- | Moss, Club + Pine, Running | Lycopodium clavatum |
| Jaelle (Westfalen) | Erle, Schwarz- | Alder, Common + Alder, European | Alnus glutinosa |
| Jagdenduewel (Mecklenburg) | Johanniskraut, Tuepfel- | St. Johnīs Wort | Hypericum perforatum |
| Jagerkruut | Scharbockskraut, Gewoehnliches | Celandine, Lesser | Ranunculus ficaria |
| Jagerkruut | Baerlapp, Keulen- | Moss, Club + Pine, Running | Lycopodium clavatum |
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