Tier 1 Seeds and Spores
These seeds and spores are readily picked up from mobs and you can buy some of these from vendors as well. So, this part of your profession leveling should not be a problem. Here is what you'll need to go from the very beginning of your skill up to 25 so that you can start on Tier 2 Cultivating when you hit the right level:
20 of any of the following seeds or spores (to go from skill level 1 - 20): Blistering Pyre Ivy Seed, Blue-Specked Gobswort Spores, Callous Gobswort Spores, Crimson Beardweed Seed, Dusty Fusk Spores, Green Shorenuts Seeds, Mottled Fusk Seeds, Motley Smedleycap Spores, Musty Elvish Parsley Seeds, Pebbled Gravelnuts Seeds, Petulant Grumpleaf Seeds, Pock-Marked Grumpleaf Seed, Prickly Goldweed Seeds, Sallow Ashberry Seeds, Prickly Goldweed Seeds, Short-Haired Thief's Nettle Seeds, Short-Stemmed Elvish Parsley Seeds, Smoking Ashberry Seeds, Smoking Pyre Ivy Seeds, Spore-Laden Smedley cap Spores, Steepled Morrweed Seeds, Swaying Dandedragon Seeds, Trenchant Elvish Parsley Seeds, Willowy Dandedragon Seeds, Wispy Beardweed Seeds, Wispy Morrweed Seeds, Woolly Thief's Nettle Seeds
5 of the following (to go from skill level 20-25): Glinting Goldweed Seeds
25 of any of the following seeds or spores (to go from skill level 25-50): Bitter Elvish Parsley Seeds, Blotchy Smedleycap Spores, Brittle Beardweed Seeds, Brittle Morrweed Seeds, Brown Shorenuts Seed, Capering Dandedragon Seeds, Charred Ashberry Seeds, Charred Pyre Ivy Seeds, Dapples Fusk Spores, Domed Morrweed Seeds, Frowning Grumpleaf Seeds, Gossamer Dandedragon Seeds, Grey-Specked Gobswort Spores, Jagged Gravelnuts Seed, Long-Haired Thief's Nettle Seeds, Probing Elvish Parsley Seeds, Rosy Beardweed Seeds, Sandy Fusk Spores, Scabrous Gobswort Spores, Scarred Grumpleaf Seeds, Searing Pyre Ivy Seeds, Spiny Goldweed Seeds, Spore-Covered Smedleycap Spores, Waxen Ashberry Seeds, Wiry Thief's Nettle Seeds
You need to cultivate these as you get them so that you'll be able to level your skill up to tier 2 by the time that your character's level is there as well. Plus, some of these take up to 3 minutes to cultivate, unless you use mixers that will help lower the time that they take to grow. And, since you're still a lower level, if you don't have a banker toon to send these to - you might consider trading with another player or vendoring these items.